Which is the correct symbol for an isotope of helium with 2 neutrons?

A magnet is useful in generating electricity because a magnetic force moves a) Protons b) neutrons c) electrons d) metal atoms

How much would a 50-kg object weigh on Mercury (gravity on Mercury is 3.59 m/s2) ? A. 13.9 N B. 179.5 N C. 310.5 N D. 490.0 N

What is the farthest that unmanned space exploration has reached? a. mars b. the moon c. beyond the milky way d. the boundaries of the solar system

If you were in a canoe on a calm lake and you threw a heavy stone into the water in front of you what would the canoe do A - the canoe would move backward a bit B - the canoe would move forward a bit C - the canoe would move forward and keep going D

Ou push a box with a force of 80 n. if the net force on the box is 50 n, what is the force on the box due to sliding friction?

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. Calculate the energy.

Three ideal polarizing filters are stacked, with the polarizing axis of the second and third filters at 21 degrees and 61 degrees, respectively, to that of the first. If unpolarized light is incident on the stack, the light has intensity 60.

What does an electric current produce

A series circuit contains three 2 Ω resistors and a 6 Ω resistor. The current in each resistor is 4.0 A. What is the voltage of the battery in the circuit? 2.0 V 3.0 V 32 V 48 V

A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1 m, they both have the same?