The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance 73 cm apart on the same axle. From the angular displacement 49.1◦ of the two bullet holes in the disks and the rotational speed 440 rev/min of the disks, we can determine the speed of the bullet.

What is the speed of the bullet? Answer in units of m/s.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.