Electric current flows when there is a-

a. charge pump

b. closed circuit

c. conductor

d. all of these

Comic-strip Superhero meets an asteroid in outer space and hurls it at 800 m/s, as fast as a speeding bullet. The asteroid is a thousand times more massive than Superhero. In the strip, Superhero is seen at rest after the throw.

In 1974, the Arecibo Radio telescope in Puerto Rico was used to transmit a signal to M13, a star cluster about 25,000 light-years away. How long will it take the message to reach M13, and how far has the message travelled so far (in light-years) ?

Deimos, a moon of Mars, is about 12 km in diameter; it has a mass of 2 x 1015 kg. With what speed would you have to throw a baseball on Deimos so that it would go into orbit and return to you so you could catch it? 5.8 m/s 4.7 m/s 2.2 m/s 3.4 m/s

The storage area of a cell is called

Suppose that a 710 kg car is traveling at 13 m/s. Its brakes can apply a force of 4000 N. What is the minimum distance required for the car to stop? Make a quantitative force diagram.

The same constant force, F, is applied to two blocks. The first block has a mass of M and the second block has a mass of 2M. Both blocks are initially at rest and the force acts on each of them for the same period of time, t.

Which of the following is an example of the strong nuclear force acting in an atom? A. A proton repelling a proton B. A neutron attracting a neutron C. A neutron repelling an electron D. An electron attracting a proton

Does the air in our atmosphere have mass?

Your instructor hands you a closed flask partly filled with room-temperature water. When you hold it, the heat transfer between your bare hands and the flask causes the water to boil. Quite impressive! How is this accomplished?

Drag each label to the correct location on the chart. Sort the items based on whether they are simple machines or compound machines. sewing machine pair of tongs fishing rod and reel seesaw wheelbarrow crane Reset Next