Which of the following is most likely to produce a loud echo? Explain your answer.
Talking in a furnished, carpeted room
Singing in a tiled shower
Yelling across an open field
Number 3
plzlzllzllz mark as a brainiest!
Answer:
b
Explanation:
yes
A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the velocity of the pebble just before it hits the ground?
A. 20 m/s
B. 40 m/s
C. 60 m/s
D. 80 m/s
Answer:
B. 40 m/s
Explanation:
v=vo+at
a= 10m/s squared
t=4s
vo=0
v=?
v=4(10)
v=40m/s
-Have a great day!
The velocity of the object just before it hits the ground is 40 m/s
The given parameters;
time of the pebble, t = 4 s
To find;
the velocity of the object just before it hits the ground;The following kinematic equation will be used;
[tex]v = v_0 + gt[/tex]
where;
g is the acceleration due to gravity = 10 m/s²;
[tex]v = 0 + 10 \times 4\\\\v= 40 \ m/s[/tex]
Thus, the velocity of the object just before it hits the ground is 40 m/s
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answer number 19 pls
Answer:
1. Net force = 90 N
2. Acceleration = 9 m/s²
Explanation:
From the question given above, the following data were obtained:
Mass (m) of bag = 10 Kg
Force applied 1 (Fₐ₁) = 45 N
Force applied 2 (Fₐ₂) = 60 N
Force of friction (Fբ) = 15 N
Net force (Fₙ) =?
Acceleration (a) =?
1. Determination of the net force acting on the bag.
We'll begin by calculating the total force applied on the bag.
Force applied 1 (Fₐ₁) = 45 N
Force applied 2 (Fₐ₂) = 60 N
Total force applied = Fₐ₁ + Fₐ₂
Total force applied = 45 + 60
Total force applied = 105 N
Finally, we shall determine the net force acting on the bag. This is illustrated below:
Total force applied = 105 N
Force of friction (Fբ) = 15 N
Net force (Fₙ) =?
Net force (Fₙ) = Total force applied – Force of friction (Fբ)
Net force (Fₙ) = 105 – 15
Net force (Fₙ) = 90 N to the right
2. Determination of the acceleration of the bag.
Mass (m) of bag = 10 Kg
Net force (Fₙ) = 90 N
Acceleration (a) =?
Force (F) = mass (m) × acceleration (a)
90 = 10 × a
Divide both side by 10
a = 90 / 10
a = 9 m/s²
Thus, the acceleration of the bag is 9 m/s² to the right.
a train covers half of its journey with a speed of 20 metre per second and the other of with the speed of 30 metre per second the average speed of the pain during the whole journey is
Answer:
25 meters per second
Explanation:
2 halves so you find the average of the two by adding 20+30=50 then dividing it by number of halves, this is 2.
50/2=25
How is the propulsion necessary to move a spacecraft through space different from the propulsion necessary to move an airplane through the air?
Answer:
Spacecraft Propulsion Systems Spacecraft propulsion is based on jet propulsion as used by rocket motors.
Explanation:
The maximum air temperature permitted for delivery vehicles when receiving shell eggs Shell eggs Receive at an air temperature of 45°F (7°C) or lower.
In which case one can reject the delivery?When receiving raw shell eggs you must reject the delivery if they don't conform to the standard range of conditions. Raw egg shells at temperature of 45°F or below should be rejected during delivery as a result of the possibility of the presence of pathogens on them which exposes individuals to diseases.
The common pathogen found in eggs is Salmonella which causes typhoid. All egg shells should be treated at higher temperatures in order to destroy them.
Raw egg shells at temperature of 45°F or below should be rejected during delivery as a result of the possibility of the presence of pathogens on them which exposes individuals to diseases.
Therefore, The maximum air temperature permitted for delivery vehicles when receiving shell eggs Shell eggs Receive at an air temperature of 45°F (7°C) or lower.
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Betsy created the following mnemonic device to help her remember the order of the planets starting from the Sun: “Most Very Elegant Mammals Sleep Just Until Noon”. Why doesn’t her mnemonic work?
a) She has Saturn and Jupiter in the wrong order.
b) She has Mercury and Venus in the wrong order.
c) She has Uranus and Neptune in the wrong order.
d) She has Earth and Mars in the wrong order.
Answer:
A
Explanation:
The order of the planets in the solar system, starting nearest the sun and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Atmospheric pressure decreases with increment in height.
give reason
Answer:
pressure=height × density×acc due to gravity
so
pressire is directly proportional to height hence it decreses with decrease in height
here air column height is measured upside down so decreases witn increment
Answer:
this is because as the altitude increases the number of air molecules decreases
Every football field has two 300kg field goal posts separated by 110m of football field (that includes the endzones). What is the gravitational force between the two goal posts?
Answer:
4.96×10¯¹⁰ N
Explanation:
The following data were obtained from the question:
Mass 1 (M1) = 300 Kg
Mass 2 (M2) = 300 Kg
Separating distance (r) = 110 m
Gravitational constant (G) = 6.67×10¯¹¹ Nm²/Kg²
Gravitational force (F) =?
The gravitational force between the two goal posts can be obtained as follow:
F = GM1M2 / r²
F = 6.67×10¯¹¹ × 300 × 300 / 110²
F = 6.003×10¯⁶ / 12100
F = 4.96×10¯¹⁰ N
Therefore the gravitational force between the two goal posts is 4.96×10¯¹⁰ N
If you answer this I will give you brainliest whoever answers first!!!
Use the information from the graph to answer the question.
What is the acceleration of the object?
--------------
m/s2
:
Explanation:
this graph show the decrease in velocity with time
at time t=0 velocity is 40 m/sec
at time t=12sec velocity is decreases from 40 to 10 m/s
so the acceleration of the object at time=12 sec is
a=v/t
a=Δv/t
Δv=v1-v2=40-10=30 m/s
a=30/12=2.5 m/s^2
So I don’t really get it can you also explain what’s the difference between radiation,conduction, and convection?
Answer:
I think its radiation
Explanation:
Conduction is the transfer of heat through solids (A)
Convection is the transfer of heat through liquids or gasses (B)
Radiation is the transfer of heat through em waves (C)
Please help me idk what dis
Question 1 (1 point)
A boy on a treasure hunt walks 12 paces West, then 21 paces North, then 25 paces
East. What is the magnitude of boy's resultant displacement in meters?
Answer:
The magnitude of the boy's displacement is 24.698 paces which is in the direction of approximately 58.24° North of East
Explanation:
The given parameters are;
The distance West the boy on a treasure hunt walks = 12 paces
The distance North the boy on a treasure hunt then walks = 21 paces
The distance East the boy on a treasure hunt then walks = 25 paces
Writing the displacement in vector format, gives;
d = -12·i + 21·j + 25·i
Which gives
d = 13·i + 21·j
The magnitude of the boy's resultant displacement is given as follows;
[tex]\left | \mathbf{d} \right | = \sqrt{d_x^2 + d_y^2}[/tex]
Where;
[tex]d_x = 13, \ d_y = 21[/tex]
[tex]\left | \mathbf{d} \right | = \sqrt{13^2 + 21^2} = \sqrt{610} \approx 24.698 \ paces[/tex]
The magnitude of the boy's displacement is 24.698 paces
The direction of the displacement is tan⁻¹(21/13) ≈ 58.24° North of East.
A marble block has dimensions of 0.4m x 0.4m x 2m. Knowing that the density of marble is 2,400 kg / m3, calculate the mass of the block and answer:
Um bloco de mármore tem dimensões 0,4m x 0,4m x 2m. Sabendo que a densidade do mármore é 2 400 kg/m3, calcule a massa do bloco e responda:
A cart is rolling along at a steady 6.6 m/s when it meets a slope. The cart accelerates at 2.0 m/s^2 as it rolls down the hill. How far from the top of the hill will the cart move in 5.5 s
Answer: 2 x 5.5= 11 m
Explanation: distance is equal to speed multiplied by time
Which statement describes a physical property related to the particles that
make up a material?
A. Carbon is flammable because its atoms combine easily with
oxygen atoms in the presence of heat.
B. Fluorine is highly reactive with other elements because its atoms
have 7 valence electrons.
C. Neon is not reactive with other elements, because its atoms have
8 valence electrons.
D. Gold is a relatively dense metal because its atoms have more
protons than atoms of many other metals.
Answer:
D
Explanation:
physical properties are properties that can be measured with instruments, such as a scale for weight.
The descriptions are chemical properties
Gold's atoms have more protons than those of many other metals, it is a particularly dense metal. Statement D explains the physical characteristics of the constituent parts of a substance.
What is density?Density is defined as the mass per unit volume. It is an important parameter to understand the fluid and its properties. Its unit is kg/m³.
Gold is a relatively dense metal because its atoms have more protons than atoms of many other metals.
Statement D describes a physical property related to the particles that make up a material. Because density is the physical property of the material.
Hence option D is corect.
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How fast will a bug that is going 640cm in 320 seconds travel across the
floor? *
O 2 seconds
O 2.56 cm/s
O 40,000 seconds
O 2 cm/s
Answer:
2 cm/s
Explanation:
As, 640cm/320s = 2cm/1s
Therefore, 2cm/ s
Conversions are essential to solving questions, what are some examples and how can we use them in the real world? If you give an example then you have to give how it is used (applied) in the real world. give two examples please Is for Sep 2, please help
Answer:
Explanation:
Conversions involve the interpolation of a particular value in a unit to it's equivalent value in another another unit. For example, the "value" of 60 seconds is the same as the "value" of 1 minute. There are several of this conversions that apply in our daily life. Two examples are provided below
1) Using the time conversion mentioned earlier. In some countries like Nigeria, talk time on phone are bought as airtime (prepaid) and one is usually charged per second of this airtime. Phones generally use the best unit to determine the exact time one has spoken for on a call. Hence, one sees values such as 1:23:16 meaning the individual has spoken for 1 hour, 23 minutes and 16 seconds. If a call is charged at 11 kobo per second, how much (in naira) will an individual be charged for speaking for that long.
1 hour can be converted to seconds by multiplying it by 3600 = 3600 s
23 minutes can be converted to seconds by multiplying it by 60 = 1380 s
16 seconds is already in seconds and will be added to the initial conversions in seconds to have 3600 + 1380 + 16 = 4996 s
If an individual charge per second is 11k, then speaking for 4996 s will cost such an individual 4996 × 11 = 54,956 kobo
To convert the said amount to naira (which is another conversion).
1 naira has the same value as 100 kobo, thus 54,956 kobo will be equal to 54956÷100 = 549.56 naira
This means the individual will be charged 549.56 naira for speaking for 1 hour, 23 minutes and 16 seconds.
2) Conversion of height in meters to feet: Some application documents (like immigration/visa documents) require you provide your height in meters while some require you provide your height in feet. Thus, an individual of 1.8 meters, will have to convert his/her height to feet by multiplying by 3.281, meaning the individual can also claim to be 5'9 feet (1.8 × 3.281).
Melissa my pet cow from childhood that i could ride like a horse had a weight of 0.65 tons. Philip my pet rabbit had a weight of 192 ounces. How many philips would it take to weigh as much as one melissa
Answer:
11 times the weight of Philip.
Explanation:
From the question given above, the following data were obtained:
Weight of Melissa (i.e cow) = 0.65 tons
Weight of Philip (i.e rabbit) = 192 ounces
Next, we shall express the weight of Philip (i.e the rabbit) in tons. This can be obtained as follow:
1 ounce = 3.125×10¯⁵ ton
Therefore,
192 ounce = 192 ounce × 3.125×10¯⁵ ton / 1 ounce
192 ounce = 0.06 ton
Thus, the weight of Philip (i.e the rabbit) in ton is 0.06 ton.
Next, we shall determine the ratio of the weight of Melissa (i.e the cow) to the weight of Philip (i.e the rabbit). This can be obtained as follow:
Weight of Melissa (i.e cow) = 0.65 ton
Weight of Philip (i.e rabbit) = 0.06 ton
Melissa /Philip = 0.65/0.06
Melissa /Philip = 11
Melissa = 11 × Phillip
Thus, it will take 11 times the weight of Philip to weigh as much as Melissa.
Plz help me answer this!!!
Answer:
C. the break down of food to create energy in the presence of oxygen
Explanation:
how is work related to energy?
Explanation:
Energy should be transferred to an object in order to move it. ... This amount of energy transferred by the force to move an object is called work or work done. Thus, the relation between Work and Energy is direct. That is, the difference in the Kinetic energy of an object is work done by an object.
A sprinter speeds up to 3 m/s during the last 2 seconds of the race with an
acceleration of 0. 4 m/s 2 . What was the initial speed of the sprinter?
Answer:
The initial speed of the sprinter was 2.2 m/s
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
The following relation applies:
[tex]v_f=v_o+at[/tex]
Where a is the constant acceleration, vo the initial speed, vf the final speed, and t the time.
The sprinter speeds up from an unknown initial speed to vf=3 m/s in t=2 seconds with an acceleration of [tex]a=0.4~m/s^2[/tex].
To find the initial speed, we solve the equation for vo:
[tex]v_o=v_f-at[/tex]
Substituting the values:
[tex]v_o=3-0.4*2[/tex]
[tex]v_o=3-0.8[/tex]
[tex]v_o=2.2~m/s[/tex]
The initial speed of the sprinter was 2.2 m/s
Two or more atoms that have been chemically combined are
called a
molecule
formula
poly atom
mixture
Answer:
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
Explanation:
i think its mixture.
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound.
What are compound?Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
Any substance made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.
Atoms from more than 100 different chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all matter in the universe.
Therefore, When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound.
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WHOEVER RESPONDS TO THIS FIRST WILL GET BRAINIEST!!!!!!
What is the velocity of a car going 4miles in 30 seconds, with the displacement of 36?
Answer:
alright i responded
Explanation:
you didnt say i had to answer
Brenda is telling a classmate that we really don’t need to worry about droughts because the supply of water on Earth is constant. Explain to Brenda and her classmate why droughts are a real concern.
Answer:
the reason droughts are a real concern is because even though water is constant doesnt mean its constant everywhere. Rain sometimes cant or wont fall in certain places, to drink sea water you've got to prepare it. even if rain falls heat can cause it to not rain to much or not rain at all.
Definition of uniform speed
Answer:
Uniform Speed: A body is said to be moving with uniform speed, if it covers equal distances in equal intervals of time. Variable Speed: A body is said to be moving with variable speed if it covers unequal distances in equal intervals of time.
Explanation:
I got it from google
Answer:
Speed is a measure of how fast an object is moving at a given instant of time. It is a scalar quantity. Its unit is m/s. For a body covering equal distances in equal time intervals, the speed is called uniform speed.
Explanation:
An object originally moving at a speed of 20. meters per second accelerates uniformly for 5.0 seconds to a final speed 50. meters per second. What is the acceleration of the object, in m/s2 to the nearest tenth?
Which statement best explains why an object appears green in sunlight?
Answer:
This question is incomplete, the options are:
A) The object absorbs most white light and refracts most green light.
B) The object refracts most white light and absorbs most green light.
C) More green light is absorbed while more red and blue light is reflected.
D) More green light is reflected while more red and blue light is absorbed.
The answer is D.
Explanation:
Light is an electromagnetic wave that contains different colours at different wavelength. The colour of light that is seen depends on the wavelength of light that is REFLECTED, while other wavelengths of light are ABSORBED. This feature is dependent on the properties of each object that received the sunlight.
For example, an object will appear GREEN because it has properties that enables it to REFLECT most of the GREEN LIGHT but absorbs most of the RED AND BLUE LIGHT in the sunlight passing through the object.
Answer:
D
Explanation:
More green light is reflected while more red and blue light is absorbed.
What is Velocity?*
O The measurement of an object's speed and direction
The measurement of an object's tendency to remain at rest
How fast an object travels
O Where an object travels
Answer:
The rate of change of displacement is called velocity.
Explanation:
How fast an object travels
Answer:
O The measurement of an object's speed and direction
Explanation:
Sound travels faster in ______ as compared to liquids.
Answer:
Gases
Explanation:
Answer: Gases.
Explanation: Sound travels faster in liquids than in gases because molecules are packed more closely together. Sound travels over four times faster than in air!
A football player kicks a ball with an initial velocity of 25 m/s at an angle of 53 degrees above the horizontal. The vertical component of the initial velocity of the ball
Answer:
20 m/s
Explanation:
initial velocity, u= 25m/s
u has two components. one in horizontal and in one vertical.
so,
u sin theta = vertical component.
=> u sin theta = 25× 4/5
= 20 m/s