Physics Answers

A charge of 600 C flows through a rheostat in which a steady current is

maintained for 120 sec. What is the current?

A steady current of 10 A maintained for 1 hr deposits 12.2 g of zinc at the

cathode. What is the equivalent mass of zinc?

A 12.5 V Battery operates s 14.2 ohms flashlight intermittently for a cumulative

time of 65.3 min. (a) What is the average current? (b) What quantity of electricity

is furnished by the battery?

What current flows through an electric iron having a resistance of 13 ohms when connected across a line having 120 V?

A charge of 3,600 C passes through an electric lamp in 3.0 min. What is the current in the lamp?

A point charge q=2.00uC is located at the origin. Find the electric potential due to this charge at point x=4.0

A man driving his sports car with 5,250 kg at auniform speed of 25 km/a in north east. What is the momentum of his sports car?

Answer the following with full solution.

1.) A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the car and the distance traveled.

2.) A feather is dropped on the moon from a height of 1.40 meters. The acceleration 

of gravity on the moon is 1.67 m/s

2. Determine the time for the feather to fall to the surface of the moon.

3.) An engineer is designing the runway for an airport. Of the planes that will use the 

airport, the lowest acceleration rate is likely to be 3 m/s². The takeoff speed for this plane will be 65 m/s. Assuming this minimum acceleration, what is the minimum allowed length for the runway?

Answer the following with full solution.

1. ) A shot is project 40° from the horizontal at the rate of 30 ft/s. (a) Find the maximum height (b) the maximum range of projectile.

2. ) A drop hammer of 1 ton weight capacity is projected downward by a 12 inch diameter cylinder. At 100 psi air pressure, what is the impact velocity if the stroke is 28 inches.

3.) A projectile is fired up the inclined plane at an initial velocity of 15 m/s. The plane is making an angle of 30° from the horizontal. If the projectile was fired at 30° from the incline, compute the maximum height z measured perpendicular to the incline that is reached by the projectile. Neglect air resistance.

Answer the following with full solution.

1.) A stone is thrown vertically up from the ground with a velocity of 400 ft per sec. How long must one wait before dropping a second stone from the top of an 800ft tower if the two stones are to pass each other 300 ft from the top of the tower?

2.) It was once recorded that a Jaguar left skid marks that were 290 m in length. Assuming that the Jaguar skidded to a stop with a constant acceleration of -3.90 m/s², determine the speed of the Jaguar before it began to skid.

3.) A capsule orbit the earth at the rate of 6000 m/s. If the radius of the Earth is 3000km, find the height of capsule from the surface of the Earth.