Answer:
A. <em>Loses PE and gains KE
</em>
Explanation:
Statement is incomplete. Complete statement of problem is:
<em>1. An object from a certain height falls freely. Which of the following happens to PE and KE when the object is half on its way down?
</em>
A. <em>Loses PE and gains KE
</em>
B. <em>Gains PE and loses KE
</em>
C. <em>Loses both PE and KE
</em>
D. <em>Gains both PE and KE</em>
If we neglect the effects of any conservative force, the application of the Principle of Energy Conservation is reduced to a sum of gravitational potential (
) and translational kinetic energies, measured in joules. That is:
(Eq. 1)
Let assume that an object falls from a height 
with a speed of zero. By definitions of gravitational potential and translational kinetic energies the previous is expanded. If final height is the half of initial value, then:
(Eq. 1b)
In a nutshell, translational kinetic energy is increased at the expense of diminishing gravitational potential energy. The correct answer is A.
Answer:
The speed of the riders on the Singapore Flyer is approximately 0.262 m/s
Explanation:
The dimensions of the tallest Ferris wheel in the world are;
The diameter of the Ferris wheel, D = 150 m
The tine it takes the Ferris wheel to make a full circle, T = 30 minutes = 30 min × 60 s/min = 1,800 seconds
The angular velocity of the Ferris wheel, ω = 2·π/T
The linear velocity of the Ferris wheel, v = r·ω = The speed of the riders
Where;
r = The radius of the Ferris wheel = D/2
D = 150 m
∴ r = 150 m/2 = 75 m
∴ v = r·2·π/T
∴ v = 75 m × 2 × π/(1,800 s) ≈ 0.262 m/s
The speed of the riders on the Singapore Flyer, v ≈ 0.262 m/s
Answer:
no:
Explanation:
it would grow and no longer be able to fit through the loop due to the hot air expanding.
Answer:
C) The force experienced by the ball equals the force experienced by the club.
Explanation:
When the golfer strikes the ball with his club, the club exerts a force on the ball. Due to Newton's Third Law Of Motion [Every Action has an equal and opposite reaction], the ball also exerts an equal force on the club. However,
As the mass of the club is usually greater than the mass of the ball, it accelerates slower; While the ball way faster, following the equation : F=ma
Answer:
Explanation:
Given
slit width 
wavelength of light 
Screen is placed at a distance of 
The angle for the first minima is given by
for m=1
and one half of central maxima is given by
Width of central maxima 
