Which two objects attract each other?

A.

a proton and an electron

B.

two electrons

C.

a proton and a neutron

D.

two protons

A pitching machine is programmed to pitch baseballs horizontally at a speed of 87 mph. The machine is mounted on a truck and aimed backward. As the truck drives away from a man at a speed of 65 mph, the machine shoots a ball towards him.

Consider a horizontal layer of the dam wall of thickness dx located a distance x above the reservoir floor. what is the magnitude df of the force on this layer that results from adding the water to the reservoir?

A 2kg marble is moving at 3 m/s when it strikes another 4kg marble moving in the opposite direction at - 3 m/s. What will be the velocity of the 4kg marble after the collision of the 2kg marble's new velocity is - 4 m/s.

What volume is occupied by one mole of gas at stp?

A car traveled 200 miles south Onl-29 in 4 hours. What's it's velocity

Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? A) The waves must have the same wavelength. B) The waves must have a constant phase difference.

Calculate the change in velocity of 70 kg object being pulled with 1000N force force 10 s

Which reaction obeys the law of conservation of mass?

Smaller bits of rock that pass through the atmosphere and slam into Earth's surface are called a. asteroids. b. meteors. c. meteorites. d. meteoroids.

What is the conversion from 1.2 mm to m