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Dennis_Churaev [7]
3 years ago
11

You might have noticed that a feather falls slowly toward the ground, while a ball falls rapidly. Which statement correctly expl

ains the motion of these objects?
1. The ball does not experience fluid friction as it falls.
2. Gravity is the only force acting on the feather and the ball.
3.The acceleration of the ball and feather are the same.
4. The feather experiences more fluid friction than the ball.
Physics
1 answer:
Brut [27]3 years ago
3 0

Answer:

4. the feather experiences more fluid friction than the ball

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Rest and motion are relatives terms justify the statement​
Anna007 [38]

Answer:

rest and motion are the relative terms because they depend on the observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body

Explanation:

3 0
3 years ago
18. Two spaceships are traveling in the same direction. With respect to an inertial frame of reference, spaceship A has a speed
quester [9]

Answer:

v_{A} -v_{B}=v_{AB}\\v_{AB} =0.9c-0.5c\\v_{AB}=0.4c

Explanation:

Because the spaceships are traveling in the same direction, you should subtract the speed of spaceship A from the speed of spaceship B in order to calculate v_{AB}.

6 0
4 years ago
How much kinetic energy does a 6kg cart have when moving at 4 m/s?
Arturiano [62]

Given:

mass = 6 kg

velocity = 4 m/s

To find:

Kinetic energy of the cart = ?

Formula used:

Kinetic energy = \frac{1}{2} m v^{2}

Where m = mass of the cart

v = velocity with which the cart is moving

Solution:

Kinetic energy of the moving cart is given by,

Kinetic energy = \frac{1}{2} m v^{2}

Where m = mass of the cart

v = velocity with which the cart is moving

Kinetic energy =\frac{1}{2} \times 6 \times \ 4 \times 4

Kinetic energy = 48 Joule

Thus, the kinetic energy of the moving cart is 48 Joule.

3 0
4 years ago
Fossil fuels has been used more in the existing world. Why?
Inga [223]

Answer:

fossil fuels are being used more because fossil fuels are of great importance because they can burn to produce a  significant amount of energy per unit mass the use of coal as a fuel prefates recorded history.

Explanation:

Hope this helps! :)

3 0
3 years ago
A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average forc
elena-14-01-66 [18.8K]

Answer:4.259 kN

Explanation:

Given

mass of bullet m=0.02 kg

final velocity of bullet v=575 m/s

time taken =2.7 ms\approx 2.7\times 10^{-3} s

We know

Impulse=F_{avg}\cdot t=change\ in\ momentum

thus

Initial Momentum(P_i)=m\times 0

Final Momentum(P_f)=m\times v=0.02\times 575

P_f=11.5 kg-m/s

F_{avg}\times 2.7\times 10^{-3}=P_f-P_i=11.5

F_{avg}=4.259\times 10^3

F_{avg}=4.259 kN

7 0
3 years ago
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