<span>A. kinetic energy. </span>
Friction converts kinetic energy into heat, and so it represents a net loss of mechanical energy. When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into heat. As demonstrated by the use of friction created by rubbing pieces of wood together to start a fire, kinetic energy is converted to heat whenever motion with friction occurs. The friction produced by brake pads in a car must generate a quantity of heat equal to the kinetic energy of the car and as a result, the brakes get quite hot.
Answer:
Explanation:
Given
velocity of antelope
antelope needs to cover a horizontal distance of 20 m
considering horizontal velocity antelope needs to cover 20 m in t sec which is given by
i.e. in 2 sec antelope needs to jump and return to ground for zero vertical displacement
h=vertical displacement
a=acceleration
t=time
for, , t=1 s
Complete Question
Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU. What is its orbital period?
Answer:
The value is
Explanation:
From the question we are told that
The semi - major axis of the rocky debris
The semi - major axis of Planet D is
The orbital period of planet D is
Generally from Kepler third law
Here T is the orbital period while a is the semi major axis
So
=>
=>
=>
Explanation:
The motion of a particle is defined by the relation as:
........(1)
Differentiating equation (1) wrt t we get:
............(2)
When v = 2 ft/s
t₁ = 2.26 s
and t₂ = 0.73 s
Put the value of t₁ in equation (1) as :
x₁ = 14.23 ft
Put the value of t₂ in equation (1) as :
x₁ = 14.74 ft
For acceleration differentiate equation (2) wrt t as :
a = 12 t - 18.........(3)
Put t₁ and t₂ in equation 3 one by one as :
Hence, this is the required solution.
The average acceleration is the change in velocity divided by change in time.