Answer:
Average force, F = 286.72 N
Explanation:
Given that,
Mass of the baseball, m = 140 g = 0.14 kg
Speed of the ball, v = 32 m/s
Distance, h = 25 cm = 0.25 m
We need to find the average force exerted by the ball on the glove. It is solved using the conservation of energy as :
F = mg
F = 286.72 N
So, the average
force exerted by the ball on the glove is 286.72 N. Hence, this is the required solution.
Answer:
Only (I) is true
i) Mass is conserved during a chemical reaction.
The energy of the ski lift at the base is kinetic energy:
where m is the mass of the ski lift+the people carried, and
is velocity at the base.
As long as the ski lift goes upward, its velocity decreases and its kinetic energy converts into potential energy. Eventually, when it reaches the top, its final velocity is v=0, so no kinetic energy is left and it has all converted into gravitational potential energy, which is
where
and h is the height at the top of the hill.
So, since the total energy must conserve, we have
and so
from which we find the height:
<span>In order to determine the wavelength, we use the wave equation:
speed = frequency * wavelength
speed of light c = 3 x 10</span>⁸<span> m/s
Frequency f = 104.1 MHz = 1.041 x 10</span>⁸ Hz<span>
c = f</span>λ
λ = c / f
λ = 3 x 10⁸ / 1.041 x 10⁸
λ = 2.88 meters
The wavelength of the waves is 2.88 meters.
C. Mechanical, because temperature can cause solid objects to expand and contract, causing rocks to split apart.
