Answer:
A star's life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. ... A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years.
When a person speaks, a sound intensity is generated that is 600 times greater than when the person whispers. What is the difference in decibels between the sound level when the person speaks compared to when she whispers
Answer:
Originally : Level = log I / I0
Currently: Level = 10 log I / I0
Level = 10 log 600 = 10 * 2.78 = 27.8
Note the term 1 bel = 10 decibels
which of the following objects has no net force acting upon it
Answer:
D and object with constant velocity
Two coins, made of different material, are placed next to each other so that they are touching. Both coins are 15mm in diameter. One coin has a mass of 6.5 g and the gravitational force between the coins is 4.03 × 10^-11 N
The mass of the second coin for the given gravitation force is 20.9 g.
The given parameters;
distance between the two coins, r = 15 mm = 0.015 mmass of one coin, m₁ = 6.5 g = 0.0065 kggravitational force between the coins = 4.03 × 10⁻¹¹ NThe mass of the second coin is determined by applying Newton's law of universal gravitation as shown below;
[tex]F = \frac{Gm_1 m_2 }{R^2} \\\\m_2 = \frac{FR^2}{Gm_1} \\\\m_2 = \frac{(4.03 \times 10^{-11}) \times (0.015)^2}{(6.67 \times 10^{-11}) \times (0.0065)} \\\\m_2 = 0.0209 \ kg\\\\m_2 = 20.9 \ g[/tex]
Thus, the mass of the second coin for the given gravitation force is 20.9 g.
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Q3- It takes you 35 min to walk to the shop. If the distances are A = 0.5 km, 8 - 1.4 km, and C = 0.8 km what was your average speed in km/h?
O 0.025 km/h
0.090 km/h
O 1.5 km/h
4.8 km/h
Q2- supposed you walk from your house to school then from school to the store, then from the store to your friend's house. If the distance is A=375, B=750, and C = 435 what was the magnitude of your displacement?
1125m
375m
1560m
2745m
Q1- Suppose you walk from your house to school then from school to the store and then from the store to your friend's house. If the distance is A=375, B=750 and C= 435, what distance did you travel?
1560
2745
1125
375
Answer: 1. .090km/h
2. I dont know
3. 1560
Explanation:
1. add all the numbers up and divide by 3 bc thats how many numbers there are.
2. I dont know
3. add all distances up
what the kinetic energy quantities in calculation pls help me
Answer:
KE = 0.5 * m * v², where: m - mass, v - velocity.
Explanation:
In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s 2.
Friction can be reduced by using ___________.
Answer:
Make the surfaces little more smoother. ...
Lubrication is another way to make a surface smoother. ...
Make the object more streamlined. ...
Reduce the Normal force acting between the surfaces in contact. ...
Reduce the contact between the surfaces, so that less number of bonds will be formed.
Suppose two ships start from point B and travel west. One ship travels at an average velocity of 35 km/h for 2.2 h. Another ship travels at an average velocity of 26 km/h for
2.5 h. What is the final position of each ship?
Answer:
Another ship travels at an average velocity of 26 km/h for
Explanation:
Ship one will cover a distance of 77 km after 2.2 hours and ship two will cover a distance of 65 km after 2.5 hours.
What are average speed and velocity?The average speed of an object is the average distance it covers in a given length of time. The scalar number reflects the average speed. Direction can be replaced with magnitude.
[tex]Average\ speed=Total\ distance/Total\ time[/tex]
Average velocity is a vector quantity. The change in position or displacement divided by the periods of time during which the change occurs is known as average velocity. Depending on how the displacement has been adjusted, the average velocity could be either positive or negative. Meters per second (m/s), or average velocity, is the SI measure for speed.
[tex]Average\ Velocity=Total\ displacement/Total\ time[/tex]
According to the question,
Ship one has an average velocity of 35 km/h for 2.2 hours.
So, total distance covered by ship one = 35 × 2.2 = 77 km.
Ship one has an average velocity of 26 km/h for 2.5 hours.
So, total distance covered by ship one = 26 × 2.5 = 65 km
Hence, the distance covered by ship one is 77 km and ship two will cover 65 km.
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According to this graph, the acceleration
is approximately:
Velocity (m/s)
MN
0
1 2 3 4
Time t(s)
5
A. 4 m/s2
B. 2 m/s2
C. 1 m/s2
D. 3 m/s2
Answer:
1 m/s^2
Explanation:
a=(v-u)/t
where,
a=acceleration
v=final velocity
u=initial velocity
(4.5-0)/4.5
1 m/s^2
How is the diametre of a spherical body measured? Explain
Answer:
To measure diameter of a spherical body using Vernier Callipers.A small, movable auxiliary graduated scale attached parallel to a main graduated scale and calibrated to indicate fractional parts of the subdivisions of the larger scale.It is useful tool to measure spherical body.Diameter of a sphere=d = 2 * r , Surface area of a sphere: A = 4 * π * r² , Volume of a sphere: V = 4/3 * π * r³ , Surface to volume ratio of a sphere: A / V = 3 / r .
Below is a diagram of a weight on a spring. When the weight is pulled down and then released, the spring compresses and expands. Each position indicates a different point in time.
Which of the following statements is true?
a
In all four positions, mechanical energy is 0 J.
b
The elastic potential energy of the spring at Position 2 is converted to kinetic energy.
c
The chemical potential energy of the spring is greatest at Position 4.
d
In all four positions, the gravitational potential energy of the spring is the same.
Answer:
B.
Explanation:
The elastic potential energy of the spriy at position 2 is converted to kinetic energy.
The elastic potential energy of the spring at Position 2 is converted to kinetic energy. Option (B) is correct.
What is potential energy?The energy held within an object is known as potential energy. There are several different types of potential energy, including gravitational potential energy, elastic potential energy, and electric potential energy.
Here, the energy that an object possesses as a result of its position in relation to other objects is referred to as its gravitational potential energy.
Elastic potential energy is the energy that an object possesses as a result of the stresses that exist inside its body.
At Position 2, the elastic potential energy of the spring is converted to kinetic energy.
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The photo shows a sea urchin embryo. A sea urchin is a multicellular organism. جام Which two processes occur as the sea urchin embryo grows? A. The embryo's cells grow larger in size. B. The amount of DNA in the embryo's body cells decreases. C. The total number of cells in the embryo's body decreases. D. The embryo's cells take in water and nutrients. SUBMIT
Answer:
d and a
Explanation:
The embryo's cells grow larger in size, and the embryo's cells take in water and nutrients. The correct options are A and D.
The two processes that occur when the sea urchin embryo matures, according to the information presented, are:
The embryo's cells grow in size: During the embryo's growth and development, individual cells divide and grow in size, contributing to the organism's total growth.
The embryo's cells actively take in water and nutrients from the surrounding environment: As the embryo grows, its cells actively take in water and nutrients from the surrounding environment to support metabolic processes and offer the essential resources for growth and development.
Thus, choices A and D represent the proper processes that occur while the sea urchin embryo develops.
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how much is a city of a body when it covers 600m in 5 min?
it is an answer : 2 m/s
i don't know sloution
Answer:
2m/s
Explanation:
5min × 60sec
=300
now,
600÷300
=2
is the right answer c?
Answer:
Yea I believe so
Explanation:
A golf ball resting on a tee is hit, and its velocity changes from 0m/s to 50 m/s traveling down the fairway in 5 seconds. What was the golf ball's acceleration?
Answer:
Explanation:
55m/s
what the speed and kinetic energy
Answer:
softball＝29.680365296803654
＝29.68/s
horse＝0.8km/m
satellite＝184.028km/m
Explanation:
distance/time
please help me answer this
Answer:
Earth's atmosphere is made up of a combination of gases. The major components of nitrogen, oxygen, and argon remain constant over time and space, while trace components like CO 2 and water vapor vary considerably over both space and time.
Explanation:
it is C
Answer:
c
Explanation: O n O
As a falling apple, approaches the ground, its potential energy
Answer:
Decreases.
Explanation:
When an object with potential energy falls to the ground, its potential energy decreases and kinetic energy increases.
NEED HELP!!! IF YOU ANSWER ALL QUESTIONS I WILL GIVE YOU BRAINEST!!!!! 15 POINTS!!!!
1. Imagine that you design running shoes for a living. Which biometric would be most useful?
A.
the average weight of a runner
B.
the number of runners in a popular urban area
C.
the points of impact when the foot hits the ground
D.
the distance that beginning runners attempt to finish
2. Mike is studying the differences between the body mechanics of swimmers in pools versus open water. What is his focus on?
A.
statics
B.
dualism
C.
statistics
D.
dynamics
3. What is the potential hazard of failing to use equipment correctly at the gym?
A.
It is poor gym etiquette.
B.
It can cause injuries or pulled muscles.
C.
Poor exercise habits can actually cause stress.
D.
The exercise will not release endorphins if you do it wrong.
4. Ira is concerned about his posture. He tests it by seeing how long he can hold good posture and finds that he feels the most discomfort in his back. What does that suggest that he needs to do?
A.
Keep a neutral spine.
B.
Place his hands on his hips.
C.
Arc his back when he walks.
D.
Tuck his chin close to his chest.
PLEASE NO LINKS
Answer: Like marathon runner is about 140 pounds
Explanation:
When does it have kinetic energy
calculate the volume of a spare with radius 7cm
Answer:
around 1436.76 cm^3
Explanation:
v = 4/3(3.14)7^3
v = 4/3(3.14)343
v = 4/3(1077.02)
v = 1436.02666667
round up
v = 1436.027
if you use pi, then the answer would be around 1436.76 cm^3
Which metals have similar chemical properties? Check all that apply.
Answer:
yes
Explanation:
A ship travels 3.20 hours with a velocity of 21.1 mph at theta= 123º, including the effects of the
current. The pilot then turns to a heading of 190.0° with a speed of 18.2 mph, including the effects of
the current. If the pilot stays on this heading for 1.10 hours, what is the ship's final displacement from
its original starting point?
The vector addition and kinematics of uniform motion allows to find the result for where the starting point is:
The ship left a point at a distance of 77,565 miles in a direction of 136.7º from the x-axis.
Given parameters
First speed v₁ = 21.3 pH Angle θ₁ = 123º Time t₁ = 3.20 h Second speed v₂ = 18.2 mph Angle θ₂ = 190.0º Time t₂ = 1.10 hTo find
Distance start point.
Velocity is a vector magnitude, therefore it has direction and module, to make the addition of these magnitudes vector algebra must be used.
There are two methods for adding vectors:
Graphic. In this case, a vector is placed at the tip of the other and the resulting vector goes from the origin of the first to the tip of the last. Analytical. In this case, the vector is decomposed into a coordinate system, the resultants are found and the vector is composed.
In the attached we can see a diagram of the displacement of this ship. We use a Cartesian reference system and using trigonometric to decompose the velocities.
First speed
cos 123 = [tex]\frac{v_1_x}{v_1}[/tex]
sin 123 = [tex]\frac{v_1_y}{v_1}[/tex]
v₁ₓ = v₁ cos 123
[tex]v_{1y}[/tex] = v₁ sin 123
v₁ₓ = 21.1 cos 123 = -11.49 mph
[tex]v_{1y}[/tex] = 21.1 sin123 = 17.70 mph
Second speed
v₂ₓ = v₂ cos 190
[tex]v_{ 2y}[/tex] = v₂ sin190
v₂ₓ = 18.2 cos 190 = -17.92 mph
[tex]v_{2y}[/tex] = 18.2 sin190 = -3.16 mph
Now we can use kinematics of uniform motion.
v = [tex]\frac{d}{t}[/tex]
d = v t
Where v is the velocity, d the distance and t the time
Let's find every distance traveled.
For first speed
x-axis
x₁ = v₁ₓ t₁
x₁ = -11.49 3.20
x₁ = - 36,768 miles
y-axis
y₁ = [tex]v_{1y} \ t_1[/tex]
y₁ = 17.70 3.20
y₁ = 56.64 miles
Travel for 2nd speed
x₂ = v₂ₓ t₂
x₂ = -17.92 1.10
x₂ = -19,712 miles
y₂ = -3.16 1.10
y₂ = - 3,476 miles
Let's find the distance traveled on each axis
x-axis
[tex]x_{total}[/tex] = x₁ + x₂
[tex]x_{total}[/tex] = -36,768 - 19,712
[tex]x_{total}[/tex] = -56.48 miles
y-axis
[tex]y_{total}[/tex] = y₁ + y₂
[tex]y_{total}[/tex] = 56.64 - 3.476
[tex]y_{total}[/tex] = 53,164 miles
Let's construct the total displacement vector, for the module let's use the Pythagorean theorem
[tex]d_{total} = \sqrt{x^2 +y^2} \\d_{total} = \sqrt{56.48^2 +53.164^2}[/tex]
[tex]d_{total}[/tex] = 77,565 miles
Let's used trigonometry for the direction
[tex]tan \theta ' = \frac{y_{total} }{ x_{total} } \\\theta ' = tan^{-1} \frac{y_{total} }{ x_{total} }[/tex]
θ’= 43.3º
This angle is in the second quadrant to indicate the angle with respect to the positive side of the x-axis in a counterclockwise direction.
θ = 180 - θ'
θ = 180 - 43.3
θ = 136.7º
In conclusion using the addition vectors and kinematics of uniform motion we can find the result for where the starting point is:
The ship left a point at a distance of 77,565 miles in a direction of 136.7º from the x-axis.
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Within a period of the periodic table, how do the properties of the elements vary?
Answer:
Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group), elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
Explanation:
The Periodic Table can predict the properties of new elements, because it organizes the elements according to their atomic numbers. ... They hope that the two nuclei at the centre of these atoms will fuse and form a heavier nucleus. When these heavy elements form, they are usually highly unstable.
You can tell if something’s a living thing or not by checking if it has?
Explanation:
To determine whether something is living or nonliving, a living thing must meet seven specific characteristics: feeding, movement, respiration, excretion, growth, sensitivity, and reproduction. A living organism needs to be able to feed to make energy and grow.
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Miss Hawaii
Can someone please give me the answers to this? ... please ...
Answer:
tell me if im wrong
Explanation:
ok and thaks sa points
physics
what are the two correct choices??
choice1
- insulating
- neutral
- large
- conductive
choice2
- potential energy
- potential difference
- charge
- electric potential
Answer:
3 and 2
May be
ok may be subscribeIsenberg Isenberg Ignatius
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the speed of light is the ______ of its frequency and wavelength. in a vacuum, this value is a constant, ______.
Answer:
multiplication; 2.99 x 10^8
Explanation:
V = (ε x u)^-1/2 = 1/(8.85 x 10^-15 x 4π x 10^7)^1/2 = 2.99 x 10^8
ultraviolet light destroys which vitamin essential for cell division?
Answer:
Both Vitamin D and folate level are affected by UV radiation from sunlight.
Explanation:
A train travels 120 miles in 2.5 hours. What is its average speed?
Answer: 48 mph
Explanation: 48*2.5=120