A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball? What is the ball's velocity?

What is the biggest star in our universe?

According to Galileo's pendulum theory, which factor determines the time taken to swing through one complete cycle?

A molecule of DNA (deoxyribonucleic acid) is 2.33 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.01% upon becoming charged.

How can you use the volume of some quantity of a pure substance to calculate its mass

If you sit on a chair and break it: A. the chair exerts more force than you. B. the force is unbalanced C. the force is balanced.

What do radio waves and microwaves have in common? A. Both have shorter wavelengths than visible light. B. Both are located to the right of visible lights on the spectrum. C. Both have higher frequencies than visible light. D.

How long can you keep string cheese in the fridge?

A particular motor can provide a maximum torque of 110 n • m. assuming that all of this torque is used to accelerate a solid, uniform, cylindrical flywheel of mass 10.0 kg and radius 3.

Round your answers to one decimal place. This parallel circuit has two resistors at 15 and 40 ohms. What is the total resistance? Ω If there is a 12 V battery in the circuit, what would the approximate current be? A

Energy transfer by convection is usually restricted to what type of substance?