What does not affect the apparent brightness of a star?

Which one of the following substances can be separated into several different elements? A: Air B: Iron C: hydrogen D: nickel

Two shopping carts are pushed with the same amount of force. The shopping carts have the same mass. Shopping cart A is pushed with three times the force as shopping cart B.

Which part of the electromagnetic spectrum has a lower frequency than visible light? ultraviolet x-rays gamma rays infrared

Two long parallel wires carry currents of 3.35 A and 6.99 A. The magnitude of the force per unit length acting on each wire is 6.03 * 10 - 5 N / m. Find the separation distance d of the wires expressed in millimeters.

while a block slides forward 1.35 m, a force pulls back at a 135 direction, doing - 17.8 J of work. what is the magnitude of the force? (unit=N)

A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?

Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.

Evaluate the force of a skateboard exerts on you if your mass is 60kg and you push on the skateboard with a force of 60N