Given :
Mass of object, m = 15.6 grams.
Volume of object, V = 2 cm³.
To Find :
The density of the object.
Solution :
We know, density of an object is given by :
[tex]\rho = \dfrac{m}{V}\\\\\rho = \dfrac{15.6}{2}\ grams/cm^3\\\\\rho = 7.8\ grams/cm^3[/tex]
Hence, this is the required solution.
if a ball is thrown up from the ground and takes 2.30 seconds before it hits the ground. A) what was its initial velocity b) what was its max velocity
Answer:
A) The initial velocity is 11.27 m/s
B) The maximum velocity is 11.27 m/s
Explanation:
A) The question is with regards to kinematic motion under gravity
The the time it takes the ball to travel up and return back to the ground = 2.30 seconds
Therefore, from the kinematic equation of motion of the ball, under gravity, v = u - g·t, we have;
t = (v - u)/g
Where;
t = The total time of the motion of the ball = 2.30 seconds
v = The final velocity of the ball = 0 m/as at the maximum height
u = The initial velocity of the ball
g = The acceleration due to gravity = 9.8 m/s²
Therefore, given that we have;
The time it takes the ball to ascend = The time it takes the ball to descend
The time it takes the ball to ascend to maximum height = 2.30 second/2 = 1.15 seconds
Substituting the parameter values of the motion to maximum height, we get;
1.15 = (0 - u)/(-9.8)
-9.8 × 1.15 = -u
11.27 = u
The initial velocity, u = 11.27 m/s
B) Given that the ball experiences a deceleration on the way up, and that the motion of a parabola is symmetrical about the vertex, which is the maximum height, where the velocity is zero, we have that the initial velocity is equal to the final velocity which are both equal to the maximum velocity
Therefore, the initial velocity = The maximum velocity = 11.27 m/s.
a pulley is used to lift a 2000 N safe over frosty's head. the safe is lifted 6m in 4s by Rudolph. how much power did Rudolph use?
Answer:
3000W
Explanation:
Given parameter:
Weight of safe = 2000N
Height of lift = 6m
Time = 4s
Unknown:
Power used by Rudolph = ?
Solution:
Power is the rate at which work is being done. It is expressed as:
Power = [tex]\frac{Work done }{Time taken}[/tex]
Work done = Weight x height = 2000 x 6 = 12000J
Power = [tex]\frac{12000}{4}[/tex] = 3000W
How much gravitational potential energy does a 1.0 kg hammer have on a shelf 1.5 m above the ground?
Answer:
14.7 J
Explanation:
PE=MGH
PE= 1.0 x 9.8 x 1.5 = 14.7 J
A 1000 kg car’s velocity increases from 5 m/s to 10 m/s. What is the change to the car’s kinetic energy? Show your work.
Answer:
k. e. = 1/2 mv^2
1/2 * 1000 * (5)^2
1/2 * 1000 * 25
12500 joules
k. e. = 1/2 mv^2
1/2 * 1000 * (10)^2
1/2 * 1000 * 100
50000
change in k. e. = final - initial
50000 - 12500
= 37500 joules
hope it helps you
Please helpp !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A current of 8 A flows through a conductor. The number of electrons passing through the conductor in each second will be
Answer:
8=3×1019 electrons per second.
Explanation:
Answer:
here
Explanation:8=3×1019 electrons per second.
A 900 kg car runs into a 70 kg deer at 28 m/s. If the car transfers all of its momentum to the deer, how fast does the deer go flying away?
Answer:
Mc = 900 Kg
Uc = 28 ms^-1
Md = 70 Kg
Ud = 0
We want Vd
Vc = Vd
This situation is elastic momentum
[tex]m _{c}u _{c}+ m _{d}u _{d} = m _{c}v _{c} + m _ dv _{d} \\ (900 \times 28) + (70 \times 0) = (900 \times v _{d} ) + (70 \times v _{d}) \\ 25200 = (900 + 70)v _{d} \\ 25200 = 970v _{d} \\ v _{d} = \frac{25200}{970} \\ v _{d} = 26 \: m {s}^{ - 1} [/tex]
Which of the following can sometimes be zero for a moving body i average velocity ii distance travelled iii average speed iv displacement
Answer:
displacement can be zero...because it only care about initial and final positionsA term used to describe a critical assessment of how an athlete acts and what they achieve either during a match or while training is known as:
A. SMART Target
B. Area of improvement
C. Performance analysis
D. Measurement of success
Answer:
I believe D
Explanation:
I'm not for sure but I think it is D
If a net horizontal force of 0.8 N is applied to a toy whose mass is 1.2 kg what acceleration is produced?
Answer:
0.67 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{0.8}{1.2} \\ = 0.666666...[/tex]
We have the final answer as
0.67 m/s²Hope this helps you
PHYSICS PLEASE HELP
a. Draw a force diagram
b. The skier has a mass of 76.6 kg and the coefficient of kinetic friction between the skier and the snow is 0.15. The angle the hill makes to the horizontal is 38 degrees and the distance the skier glides down the hill is 40.5 m. Answer the following questions based on this information.
What is the magnitude of the normal force on the skier as they glide down the hill? Show your work.
c. What is the magnitude of the force of friction on the skier as they glide down the hill? Show your work.
d. What is the acceleration of the skier as they glide down the hill? Show your work.
e. What is the speed of the skier when they reach the end of the straight section of the hill? Show your work.
f. How many seconds does the skier take to reach the end of the straight section of the hill? Show your work.
Answer:
Explanation:
b )
Normal force R = mgcosθ
= 76.6 x 9.8 x cos 38
R = 591.5 N
c )
Force of friction
= μ R
μ is coefficient of friction .
= .15 x 591.5
= 88.73 N
d )
Net force
= mg sinθ - friction
= 76.6 x 9.8 x sin 38 - 88.73
= 462.16 - 88.73
= 373.43 N
Acceleration = 373.43 / 76.6
a = 4.87 m / s²
e )
v² = u² + 2 a s
s = 40.5 m
a = 4.87
u = 0
v² = 0 +2 x 4.87 x 40.5
= 394.5
v = 19.86 m /s
f )
v = u + a t
19.86 = 0 + 4.87 t
t = 4 .07 s
AGREE OR DISAGREE: All light can be seen.
Answer:
Disagree
Explanation:
We cannot see infared lights.
Waves move fastest in
low-temperature gases.
low-temperature solids.
high-temperature gases.
high-temperature solids.
A ball is pushed into a spring-loaded launcher with a force of 20 N, which compresses the spring 0.08 m.
A) What is the spring constant of the spring
B) Find the elastic potential energy (PEs) stored in the spring (or the work done on the spring)
Answer:
0.8J
Explanation:
Given parameters:
Force = 20N
Compression = 0.08m
Unknown:
Spring constant = ?
Elastic potential energy = ?
Solution:
To solve this problem, we use the expression below:
F = k e
F is the force
k is the spring constant
e is the compression
20 = k x 0.08
k = 250N/m
Elastic potential energy;
EPE = [tex]\frac{1}{2}[/tex] k e² = [tex]\frac{1}{2}[/tex] x 250 x 0.08²
Elastic potential energy = 0.8J
The diagram below shows an electric circuit with a battery and a bulb.
What energy transformations would occur when the bulb lights?
B. chemical to electrical to light
C. electrical to mechanical to light
D. chemical to electrical to solar
A. light to electrical to chemical
(First answer gets brainliest)
Answer:
B. chemical to electrical to light
The battery holds chemical energy, which is transformed to electrical energy due to flow of electrons.
The electrons due to their drift velocity which heats up the bulb filament hence producing light.
Answer:
B
Explanation:
because i learned in 5th grade
A 120 Ω resistor, a 60 Ω resistor, and a 40 Ω resistor are connected in parallel and placed across a potential difference of 12.0 V. What is the equivalent resistance of the parallel circuit?
Answer:
The equivalent resistance of the parallel circuit would be 20 Ω
Explanation:
To calculate the resistance of resistors connected in parallel, the formula to be used is
1/R = 1/R₁ + R₂ + R₃ + R₄...
1/R = 1/120 + 1/60 + 1/40
1/R = (1 + 2 + 3)/120
1/R = 6/120
1/R = 1/20 Ω
This can be rewritten or cross-multiplied to be
R × 1 = 20 × 1
R = 20 Ω
The equivalent resistance (R) would then be 20 Ω
Who would like to be my girlfiend ?
nobody this is a app to help others
Answer:
I bet my great grandmother would
While having an argument, two people each push on a couch with 200 N of force in opposite directions. What is the net force on the couch? Explain how you found the answer.
Answer:
Explanation:
Net force = 0
This is a very instructive question to do. Here's what the situation looks like
[tex]====>\box{Couch) }<====\\[/tex]
The two forces are going in opposite directions. One is going 200 N to the right and the other is going 200N to the left.
The net result is 0.
Put in formula form, it looks like this.
Going left is the negative direction
F_right - F_left = 200 - 200 = 0
Use a ballistic cart to shoot a small ball into the air. Push the cart along a track, allowing it
to release the ball. What explains why the cart always catches the ball, and the ball doesn't
fall behind the moving cart?
Answer:
Explained below.
Explanation:
The ball doesn't fall behind the moving cart because the horizontal motion of the ballistic cart is not affected by the forces that act in the vertical direction. Therefore, when the cart is pushed, it means that the ball will shoot up and then it will land right back in the barrel.
Rex scored the following marks in 6 subjects:
English - 88
Hindi - 64
Sanskrit - 89
Maths - 96
Science - 87
Social Studies - 80
Find his average score in 6 subjects.
If the only force acting on an object is friction during a given physical process, which of the following
assumptions must be made in regard to the object's kinetic energy?
Answer:
The kinetic energy decreases.
Explanation:
Friction is defined as a opposite force to motion. If friction is the only force acting on an objects, its kinetic energy decreases.
It is so because due to resistive force or friction, kinetic energy is converted to heat energy and that reduces the total kinetic energy in the system.
Hence, the correct answer is "The kinetic energy decreases."
The assumptions must be made base in the object’s kinetic energy in a situation whereby frictional force is the only force acting on an object is A:The kinetic energy decreases.
Frictional force can be regarded as opposing force that is formed between two surfaces which have their movement in the same direction or opposite directions. Friction always brings about reduction in motion of a body which in turn bring a decrease to it's kinetic energy, because it us an energy of motion.Therefore, option A is correct.
Learn more at:
https://brainly.com/question/3763752?referrer=searchResults
You look at yourself in the mirror and notice many of your physical features: your hair color, eye color, your height, dimples, etc. How does DNA relate to the way you look the way you do?
well, you get some DNA from both of your parents, so when you hear the phrase, "You have your mother's eyes!" That means you have some of your mother's DNA that gave you her eye color. The DNA you get from your parents help determine how you look today
What is the acceleration of an object that has a mass of 10kg and is pushed with a force of 50n
Answer:
5m/s/s
Explanation:
force = mass x acceleration
50 = 10a
a=5m/s/s
How would you measure the volume of an oddly shaped object
By breaking the object into tiny pieces and placing them in a beaker
By placing it on a triple beam balance
By placing it in a room without gravity
By placing it in water and measuring how high the water rises
Answer:
By placing it in water and measuring how high the water rises
Explanation:
You can place the object in a can filled with water. You'll then see that as it sits there, the water level rises. You would then measure that to find the volume.
how can an object travel 6 meters if it ends up at -2 on the number line?)
Answer: Distance is a scalar quantity and direction is not applicable. We can use graphs to depict an object's change in position over time. Create a large number line in the classroom by taping index cards on the floor or wall 1 meter apart.
Explanation: I really hope that was helpful.
The international space station travels 110,304 km in 4 hours. What is
speed of the ISS in Meters per second. (3600 seconds = 1 hour)
Answer:
7660 m/s
Explanation:
multiply 110304 x 1000 to turn it into meters then turn 4 hours into seconds making it 14400 seconds. Then divide 11030400 by 14400
A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge?
A. 2.2 ɥC
B. 680 ɥC
C. 2.2 C
D. 680 C
can someone explain this in detail because im having a hard time understanding these type questions...thank you!!
Answer:
A. 2.2 ɥC
Explanation:
Given;
electric field strength, E = 1236 N/C
distance of the source charge, r = 4 m
Electric field strength is calculated as;
[tex]E = \frac{kQ}{r^2}[/tex]
where;
Q is the magnitude of the source charge
k is Coulomb's constant = 9 x 10⁹ Nm²/C²
[tex]E = \frac{kQ}{r^2} \\\\kQ = Er^2\\\\Q = \frac{Er^2}{k} \\\\Q = \frac{(1236)(4^2)}{9 \ \times \ 10^9} \\\\Q = 2.197 \ \times \ 10^{-6} \ C\\\\Q = 2.197 \ \mu \ C[/tex]
Therefore, the correct option is A. 2.2 ɥC
An electric motor transforms potential energy into mechanical energy.
Please select the best answer from the choices provided
T
F
Answer:
t
Explanation:
Answer:
False
Explanation:
What are Alpha rays
please its aurgent
Answer:
An alpha ray is a stream of alpha particles. An alpha particle consists of two protons and two neutrons bound together into a particle identical to a helium nucleus.What is the density of a box measuring 100 grams and 10 ml?
Answer:
In order to convert density to grams, you have to put the mass on one side of the equation, and the density and the volume on the other. Therefore, d * v = m. Multiply the density by the volume. Using the example in step 1, you would multiply 2 g/mL by 4mL.
Explanation:
ok