If a star is 10 light-years away from us and it explodes today, when will we know that it exploded?

today

10 years from today

10 parsecs from today

Which of the following describes sound waves A. Waves that do not require a medium and in which the vibrations are parallel to the motion of the sound B.

Which way does current always flow?

A 500 kg empty elevator moves with a downwards acceleration of 2 m/s2. What is the tension force of the cable on the elevator? 5000 N 4000 N 6000 N 1000 N

How do protons neutrons and electrons affect the charge of an atom?

A box is being pulled to the right on flat ground with a force of 112 N at an angle of 42° to the horizontal. What is the x-component of the force of tension?

A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m. The car maintains its speed over the bump. What is the normal force exerted by the seat of the car on a 60.

Determine the magnitude of the force p required to hold the 180-kg crate in equilibrium.

Match the following: 12) Site where resistance to blood flow is greatest. 13) Site where blood pressure is lowest. 14) Site where exchanges of food and gases are made. 15) Site where the blood pressure is greatest.

How many trees were sold in all during 1999 and 2000?

a cannon sits on a stationary railroad flatcar with a total mass of 1000 kg. when a 10 kg cannonball is fired to the left at a speed of 50 m/s, what is the speed of the flatcar