Physics Answers

In a collision between two unequal masses, which mass receives a greater magnitude

impulse?

A. The larger mass

B. The smaller mass

C. They receive equal impulses

D. Depends which direction they're moving in

Three cars (call them A, B, and C) are moving with the same speed but in dierent

directions. Car A has the most mass and Car C has the least mass. Suddenly, all three drivers

slam on their brakes and the cars skid to a stop. If the coecient of friction between the tires

and the road is the same for all cars, which car skids the longest till it stops?

A. Car A

B. Car B

C. Car C

D. They all travel the same distance

A vial of blood in a horizontal centrifuge has mass of 0.5 kg. The vial has a length

of 10 cm and is 30 cm from the center of the device. If the centrifuge is spinning at 3000 rpm,

how much work is done by the net force during each revolution? (Use g = 10 m/s2 for your

calculation)

A. 0 J

B.  J

C. 2 J

D. 3 J

An object has weight W on earth. What is the weight of the object if it's on a planet

with 1=6 the mass of the earth and 1=3 the radius of earth?

A. 1

2W

B. W

C. 3

2W

D. 2W

At what velocity will this drop of dextrose hit the floor?

A satellite of mass M orbits the earth with period T. A second satellite of mass 2M

is at the same radial distance from the center of the earth as the first satellite. What is the

period of the second satellite?

A. 1

2T

B. T

C. 2T

D. 4T

How long will it take a drop of dextrose from a bottle 2.30 m high hit the floor?

A satellite of mass M orbits the earth with period T. A second satellite of mass 2M

is at the same radial distance from the center of the earth as the rst satellite. What is the

period of the second satellite?

A. 1

2T

B. T

C. 2T

D. 4T

You are on a recently discovered planet in our solar system that has the same mass

density as earth, but twice the radius.

A. Do you weigh more or less on this planet than you do on earth? By what factor does

your weight change?

B. What is the escape speed of the planet?

C. What is the shortest possible period for a satellite orbiting this planet?

D. If the mass of the sun is Ms = 1:99  1030 kg, how far away must this new planet be

to have the same period as earth?

A PAF helicopter is flying with a horizontal speed of 8.00 m/s distributing relief goods to lahar stricken families in Pampanga. A family stranded on the roof of their house is about 6.00 m below the chopper. With what velocity does the package hit the roof? *