Answer:
At a sunny day at the beach, the top of the sand is warm. The radiation from the Sun heats up the surface of the sand, but sand has a low thermal conductivity, so this energy stays at the surface of the sand.
Answer:
use the formula negative -eE/A×t
Answer:
Change in momentum is 1.1275 kg-m/s
Explanation:
It is given that,
Mass of the ball, m = 274 g = 0.274 kg
It hits the floor and rebounds upwards.
The ball hits the floor with a speed of 2.40 m/s i.e. u = -2.40 m/s (-ve because the ball hits the ground)
It rebounds with a speed of 1.7 m/s i.e. v = 1.7 m/s (+ve because the ball rebounds in upward direction)
We have to find the change in the ball's momentum. It is given by :
So, the change in the momentum is 1.1275 kg-m/s
The displacement of the car after the given final velocity is 31.59 m.
The given parameters;
- Initial velocity of the car, u = 24.5 m/s east
- Final velocity of the car, v = 18.3 m/s east
- Acceleration of the car, a = 4.2 m/s²
The displacement of the car after the given final velocity is obtained by applying the third kinematic equation as shown below;
v² = u² + 2as
Thus, the displacement of the car after the given final velocity is 31.59 m.
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