Pushing a Boulder
In the figure shown, a 500 kg boulder is pushed 40 m along a slope. What is the potential energy (kJ) at the top?
Expand Hint
Vertical distances are only relevant in potential energy problems. Ignore the slope and angle.
Hint 2
Potential Energy in a Gravity Field:
$$$U=mgh$$$
where
$$m$$
is the mass,
$$g$$
is the acceleration due to gravity, and
$$h$$
is the height.
Vertical distances are only relevant in potential energy problems. Ignore the slope and angle. For Potential Energy in a Gravity Field:
$$$U=mgh$$$
where
$$m$$
is the mass,
$$g$$
is the acceleration due to gravity, and
$$h$$
is the height. Thus,
$$$U=(500kg)(9.8m/s^2)(10m)=49,000\frac{kg\cdot m^2}{s^2}=49\:kJ$$$
49 kJ
Time Analysis
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