Answer:
The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown. How the heat
Explanation:
It is given that,
Diameter of the semicircle, d = 45 m
Radius of the semicircle, r = 22.5 m
Speed of greyhound, v = 15 m/s
The greyhound is moving under the action of centripetal acceleration. Its formula is given by :
We know that, 
Hence, this is the required solution.
You need to form a hypothesis based on what is already known about gold and then devise an experiment to test this hypothesis.
For example, the density of gold is well known. So your hypothesis would be that if the rock were gold, you could predict the amount of water displacement in a beaker simply by measuring the weight of the rock.
The steps would be:
1. research what is already known about your field of investigation (in this case <em>gold</em>).
2. Using that information, formulate a hypothesis that allows you to make predictions.
3. Devise an experiment that can test your predictions.
the following statements about the motion of the elevator could be true at time t2 is
c. The elevator is moving downward at constant speed.
Explanation:
- Under given situation, the elevator is at rest and the reading on the scale is 500N.
- After some time t2, the person is still standing on the scale and the reading on the scale is 400N .
- It is because if you stand on a scale in an elevator which is accelerating upward, your body will feel heavier because the elevator's floor pressure which presses harder on your feet, and this is why the scale will show a higher reading than the time when the elevator is at rest.
- Similarly on the other hand, when the elevator accelerates downward, your body will feel lighter. The force which is exerted by the scale is called as the apparent weight; which means it does not change with constant speed.
- Applying Newton's second law, which concludes about this particular statement about force exerted on a body when at rest and when in motion.
