Questions from College Physics

Q: Two point charges are located on a coordinate system as follows:

Two point charges are located on a coordinate system as follows: Q1 = −4.5 µC at x = 1.00 cm and y = 1.00 cm and Q2 = 6.0 µC at x = 3.00 cm and y = 1.00 cm....

Q: Two point charges (+10.0 nC and −10.

Two point charges (+10.0 nC and −10.0 nC) are located 8.00 cm apart. (a) What is the change in electric potential energy when a third point charge of −4.2 nC is mo...

Q: What is the ground-state electron configuration of a K+

What is the ground-state electron configuration of a K+ ion?

Q: In the railroad freight yard, an empty freight car of mass

In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1.0 m/s and collides with an initially stationary, fully loaded boxcar of mass 4.0m. The two cars cou...

Q: A new dormitory is being built at a college in North Carolina

A new dormitory is being built at a college in North Carolina. To save costs, it is proposed to not include air conditioning ducts and vents. A member of the board overseeing the construction says tha...

Q: After a day at the beach, a child brings home a

After a day at the beach, a child brings home a bucket containing some saltwater. Eventually the water evaporates, leaving behind a few salt crystals. The molecular order of the salt crystals is great...

Q: Massimo, a machinist, is cutting threads for a bolt on

Massimo, a machinist, is cutting threads for a bolt on a lathe. He wants the bolt to have 18 threads per inch. If the cutting tool moves parallel to the axis of the would-be bolt at a linear velocity...

Q: The resistance of a conductor is 19.8 Ω at 15

The resistance of a conductor is 19.8 Ω at 15.0°C and 25.0 Ω at 85.0°C. What is the temperature coefficient of resistance of the material?

Q: You are walking to class with a backpack full of books.

You are walking to class with a backpack full of books. As you walk at constant speed on flat ground, does the force exerted on the backpack by your back and shoulders do any work? If so, is it positi...

Q: A train of mass 55 200 kg is traveling along a straight

A train of mass 55 200 kg is traveling along a straight, level track at 26.8 m/s. Suddenly the engineer sees a truck stalled on the tracks 184 m ahead. If the maximum possible braking force has magnit...