A child sits motionless on a swing. Which of the following forces does not act on the swing?

14 % 1 Question 8 of 42 An aeroplane's engines provide a force of 30,000N as it accelerates down the runway. The mass of the aeroplane is 4000kg. Work out the acceleration of this aeroplane.

One property that makes electromagnetic waves differ from other types of waves is that they can

You are walking in the forest with some friends when a wild bear shows up! Naturally, you all begin running faster. Assume that you had an initial velocity of 0.5 m/s. After running for 20 seconds, you are 50 meters away from where you started.

The power company charges $0.07/kWh. If you use 50 kWh in a day, how much will you be charged for that day?

A spherical planet has twice the mass and twice the radius of the earth. if a man weighs 810 n on earth, what would his weight be on the surface of that planet?

If the abosolute of a gas is 600 k, the temperature in degrees Celsius is

How does an electromagnetic wave propagate itself? a. A changing magnetic field induces an electric field perpendicular to the magnetic field. b. A changing electric field induces a magnetic field perpendicular to the electric field. c.

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth

A 50,000 kg locomotive is traveling at 10 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? Assume the track is level.

A rectangular loop of wire with sides 0.262 and 0.401 m lies in a plane perpendicular to a constant magnetic field (see part a of the drawing). The magnetic field has a magnitude of 0.