Explain whether or not there must be an unbalanced net force acting on any moving object

Our galaxy, the Milky Way, has a diameter of about 100,000 light years. How many years would it take a spacecraft to cross the galaxy if it could travel at 99% the speed of light?

A bookcase has a mass of 37 kg. What is the weight of the bookcase?

When analyzing the results of a scientific experiment, Kevin should base his conclusion on A. the empirical evidence that was collected in other prior experiments. B. the empirical evidence that is collected during the experiment. C.

Which statements describe a closed circuit? Select three options. Bulbs will shine. Bulbs will not shine. The circuit is incomplete. The circuit is complete. Charges flow. Charges do not flow.

What happens to the energy of the electron when it absorbs a photon? A. There is no change in the energy of the electron. B. The energy of the electron increases. C. The energy of the electron decreases. D.

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge.

What has more momentum: a sports car moving at 100 mph or a train that is not moving?

What is your mass in kilograms?

The dimensions of a block that weighs 30 N are 0.23 mx 0.12 mx 0.075 m. What pressure does the brick exert on the ground if it is resting on its largest face?

What is the current in a circuit with a 9.0 V battery and a resistance of 36.0 Ω?