Other Physics Answers

Two blocks with masses m₁ = 1.7 kg and m₂ = 4.6 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 72.0 cm and has negligible mass. When both blocks are released simultaneously and the spring has dropped to the surface, m₁ is found to have a speed of 2.1 m/s. What is the speed of m₂?

Which of the following statements are true? Select all correct. If none correct, enter N.

1. If there are no external forces, the linear momentum of a system can change.
2. If two object have the same mass and speed, their linear momentum must be the same.
3. If two objects have the same velocity, their linear momentum can be different.
4. If there are no external forces on a system of objects, the linear momentum of each object in the system must be constant.
5. Linear momentum had units of kg m/s.

A dog, with a mass of 9.0 kg, is standing on a flatboat so that he is 22.0 m from the shore. He walks 6.9 m on the boat toward the shore and then stops. The boat has a mass of 37.0 kg. Assuming there is no friction between the boat and the water, how far is the dog from the shore now?

A 500 kg cannon and a supply of 33 cannon balls, each with a mass of 16.2 kg, are inside a sealed railroad car with a mass of 33000 kg and a length of 48 m. The cannon fires to the right; the car recoils to the left. The cannon balls remain in the car after hitting the wall. After all the cannon balls have been fired, what is the greatest distance the car can have moved from its original position? What is the speed of the car after all the cannon balls have come to rest on the right side?

 The bumper cars crash into each other and stop.Explain why both bumper cars stop after the crash.

A stonc is thrown horizontally out to sea from the

top of a vcrtical clilf and with a specd of l0 Oms'''

The ciiflis 122 5m high. Find

(l) thc timc it takes the stone to hit the rvater;

(2) the speed of the stone ald the direction in which

it is fravclling when it hits the water;

(3) the horizontal distance fromthe bottom ofthe

clilf at which the stone hits the water'

Ifthc stone:hits.a seagull,3 seconds after it is

thrown, find

(4) its velocity when it hits the seagull;

(5) how lar the seagull was from the clilf when it

was hit;

(6) the height above the water at which the seagull

was flYrng.

a thin hair of water of refractive index 1.33 and constant thickness is trapped between two glass plates (n = 1.33). white light normally falls on the water film. When viewed perpendicular to the water film, the film regulates light of wavelength 400 more strongly and does not reflect light of wavelength 500 nm. the thickness of the water film in nanometers is

Question 1: Mirrors and Lenses

a) Suppose a concave meniscus lens is made from glass with n=1.50, with a focal length of -50.0cm and the radius of curvature of the concave surface is 30.0cm.

i. What is the radius of curvature of the convex surface? Is this a diverging lens or a converging lens?

ii. If I were to use the same lens to magnify a small insect using the same focal length to form a virtual image, that is, 45.0cm in front of the lens; where should the small insect be

placed?

b) How far apart are an object and an image formed by a 75.0cm focal length converging lens if

the image is 2.5x larger than the object and is real.

1. A drag racer constantly accelerates at a rate of 39 m/s2

to increase its speed in a short amount of time. If the drag racer started at rest, what distance did it have to travel to reach a velocity of 33 m/s, E?