Review 83500 J

1. A 90.0 kg man climbs hand over hand up a rope to a height of 9.47 m. How

much potential energy does he have at the top?

2. A 50.0 kg shell was fired from a cannon at earth's surface to a maximum

height of 400. m.

a. What is the potential energy at maximum height?

b. It then fell to a height of 100. m. What was the loss of PE as it fell?

3. A person weighing 645 N climbs up a ladder to a height of 4.55 m.

a. What work does the person do?

b. What is the increase in gravitational potential energy?

c. Where does the energy come from to cause this increase in PE?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.