A car moves through a straight line. The first journey is made in 2 hours at a velocity of 50 km/h and the second journey is made in 1 hour at a velocity of 60 km/h. What is the half time for the...

The electric field between the plates of a parallel plate capacitor is horizontal, uniform, and has a magnitude E. A small object mass 0.0250 kg and charge -3.10 µC is suspended in the field by...

When an electron moves from A to B along an electric field line in the figure, the electric field does 5.25 × 10-19 J of work on it. What are the electric potential differences (a)VB - VA, (b)VC -...

Jessie (m=56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster loop.  What force does Jessie feel from her seat at the bottom of the loop? (ans: 3707N) We...

A 2.5 g steel ball moving 0.40 m/s collides elastically with a stationary, identical ball. As a result, the incident ball is deflected 30.00 from its initial path (remember the 900 rule...

There is a collision at an intersection as a 2080-kg pickup truck traveling north at 32.6 m/s collides with a 18400-kg dump truck moving east at 12.4 m/s. The pickup and the dump truck entangle...

A ball is thrown with an initial velocity of 120m/s at an angle of 300 above the horizontal. If it is thrown off of a cliff that is 100m high How long will it take to hit the ground? (ans: 13...

A child with a weight of 190 N swings on a playground swing attached to 2.00 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest...

Consider the head-on collision of two masses, m1 = m, with initial velocity v1 = v0, and m2 = 2m with its initial velocity v2 =v0/2 . After the collision they stuck together. Find...

You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of 265 N in the positive x direction to try and move the 59 kg refrigerator. The coefficient of static...

In an exciting game, a baseball player manages to safely slide into second base. The mass of the baseball player is 88.9 kg and the coefficient of kinetic friction between the ground and the player...

I have been using the equation Kq1q2/r and have been making 0.15nm 1.5x10^-10 and q = 1.60x10^-19. the answer is 1.39x10^-17. I can't seem to get this answer. Thanks.