Physics Questions

1. There is an analogy between rotational and translational physical quantities. Identify the rotational term analogous to each of the following linear quantities: acceleration, force, mass, work, translational kinetic energy, linear momentum, impulse. (Example: impulse F Delta-t corresponds to angular impulse, tau Delta-t . (Gr ...continues

Physics Questions

1. Competitive divers pull their limbs in a curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down. Explain the effect of both actions on their angular velocity. What is the effect of these actions on their angular momentum? 2. What is the final velocity ...continues

Physics Questions

1. (a) Calculate the mass of the earth given the acceleration of gravity at the north pole is 9.830 m/s^2 and the radius of the earth is 6371 km from pole to pole. (b) Compare this with the accepted value of 5.979 x 10^24 kg. 2. (a) Calculate the ratio r^3/T^2 for the moon's orbit about the earth, where r is the average radi ...continues

Physics Questions

1. A bathroom spring scale obeys Hooke's law and is depressed 0.750 cm by its maximum load of 120 kg. What is the springs effective force constant? 2. Fish are hung on a spring scale to determine the mass (most fishermen feel no obligation to report the mass truthfully). (a) What is the force constant of the spring in such a ...continues

Physics Questions

1. What is the weight in newtons and the mass in kg of a 5-lb bag of sugar? 2. Suppose my mass is 70 kg. What is my weight (in N) on Earth? What would my weight be on the moon, where g = 1.62 m/s^2? 4. Suppose my mass is 60 kg. I am standing in an elevator on a bathroom scale which reads in Newtons. (A) Draw a free-body ...continues

It is possible for the velocity of a rocket to be greater than the exhaust velocity of the gases it ejects?

It is possible for the velocity of a rocket to be greater than the exhaust velocity of the gases it ejects? When that is the case, the gas velocity and momentum are in the same direction as the rocket's. How does the rocket still obtain thrust by ejecting the gases?

Three blocks are connected, as shown in the diagram, by light strings on a horizontal table.

Three blocks are connected, as shown in the diagram, by light strings on a horizontal table. We assume there is no friction between table and blocks. The force T3 = 65 N, M1 = 12 kg, M2 = 24 kg, and M3 = 32 kg. (A) Find the acceleration of the system. (B) Find the tensions T1 and T2 in the strings indicated. Graph is attache ...continues

A mass is hung on ropes between two walls, as shown in the diagram...

A mass is hung on ropes between two walls, as shown in the diagram. The tension in the rope on the right, which is horizontal, is 20.0 N. (A) Find the tension in the rope on the left. (B) Find the mass that is hanging. (Answers: 26.1 N, 1.7 kg) Graphic is attached.

A 5.0 kg block is pulled along a horzontal surface...

A 5.0 kg block is pulled along a horzontal surface by a cord that exerts a force T = 12.0 N at an angle 35 degrees above the horizontal. There is no friction (A) Draw a free-body diagram of the block, labeling all forces. (B) What must be true of the sum of the vertical components of all forces? Why? (C) Determine the accelerati ...continues

Suppose we have a spring whose force as a function of compression...

Suppose we have a spring whose force as a function of compression is shown in the graph. We place a ball of mass 0.600 kg on top of the spring and compress it by 0.25 m from its relaxed length. We then let the ball go. When the ball is released, its height above the floor is 0.10 m. Graphic is attached.