Mischka is an amateur astronomer. Using her telescope, she looks out past the Earth's atmosphere and observes an object with a long, bright, cloud-like tail behind it. What is Mischka observing?

an asteroid

a meteorite

a comet

a meteoroid

Protons are released from rest in a Van de Graaff accelerator. They start from a region where the potential is 7.15 MV then travel through a vacuum region to a region where the potential is zero.

You place a 10 kg block on a ramp with an angle of 20 degrees. You push the block up the ramp giving it an initial velocity of 15 m/s. If the coefficient of friction between the block and the ramp is 0.

What percentage of the intensity gets through both polarizers?

Why does a transformer require AC rather than DC? A. so that the magnetic field can be intensified B. so that the energy will be able to be transferred from one coil to another C. so that there will be enough voltage for transformation D.

A body of 2.0kg mass makes an elastic collision with another at rest and continues to move in the original direction but with 1/4 of it's original speed. what is the mass of the struck body?

Have scientists discovered a fifth fundamental force of nature?

To study the properties of various particles, you can accelerate the particles with electric flelds. A positron is a particle with the same mass as an electron but the opposite charge (+e). Express your answer in vector form.

A lawnmower engine running for 20 minutes does 4560000 j of work. What is the power output of the engine

Which of the following is a conductor for electricity? Question options: wood wool water rubber tire

The area where the magnetic force is exerted is known as which of the following? A. pole B. domain C. field D. area