The Earth radius is
.
For the law of conservation of energy, the energy required to move the object to an altitude of h=2r is equal to the gravitational potential energy of the object at that altitude, which is
And this is the energy required to move the object at that altitude.
Answer:
Explanation:
The work increased the potential energy
W = PE = mgh = 40(9.8)(15) = 5880 J(oules)
Answer:
the work done by the person
the work done by gravuty
Explanation:
Because the velocity is constant the cyclist has to excert a force equal to the component of the weight.
The work done by the person is given by:
and the work done by the gravity:
When the bus starts moving forward, the man stays still, so
he leans back. When the bus slows down, the man continues
moving forward at constant speed, so he leans forward.
All of this is a demonstration of the effects of inertia.
Because the specific metals aren’t mentioned in this inquiry.
The educational guesses that we can propose is that:
<span><span>1. </span>The
hypothetical inquiry: There are existing metals for making pots that will cook
food much faster.</span>
<span><span>2. </span>The
one-tailed alternative hypothesis: There are other metals for making pots that
will cook food much faster than the other metals.</span>
<span><span>
3. </span>The
one-tailed null hypothesis: All metals that are used in making pots will cook
food at an equal rate.</span>