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(a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?
The coefficient of kinetic friction between the tires and the road is 0.725. How far does the truck skid before coming to a stop?
The drop in her vertical height is 2.6 m. If her mass is 59 kg, how much work is done by the (nonconservative) force of the wave?
By how much does the potential energy of a(n) 20.5-kg child increase when the child climbs a normal staircase to the second floor?
The hammer throw is a track-and-field event in which a 7.8-kg ball (the ''hammer''), starting from rest, is whirled around in a circle several times and released. It then moves upward on the familia
A 2.50 kg mass is attached to a light cord that is wrapped around a pulley of radius 3.45 cm, which turns with negligible friction. The mass falls at a constant acceleration of 3.85 m/s2. Find the m
A boy of mass 46.2 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.2 m/s. The boy falls off the skateboard, and his center of mass moves forward at a speed of 10.9 m/s. Find
Four point charges are placed at the corners of a square of side 0.20 m. The top two charges are 16 µC and the bottom two are -16µC. Find the electric field at the center of the square.
A heat lamp emits infrared radiation whose rms electric field is Erms = 3500 N/C. (a) What is the average intensity of the radiation? (b) The radiation is focused on a person's leg over a circular a
Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answe
The orbital speeds of the planets are determined to be 40.0 km/s and 50.7 km/s. The slower planet's orbital period is 7.25 years. (a) What is the mass of the star? (b) What is the orbital period of
A basketball player tries to make a half-court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51(degrees), 14.0 m from the basket, what speed must t
The charges repel each other so that the angle between each string and the vertical is 30?. Find the charge on each ball, assuming they are equal.
What are the minimum dimensions for the rear-view mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?
Calculate the electric field required to drive 0.15 amperes of current through the glowing bulb and show that it is huge compared to the field in the connecting copper wires.
An office copier uses a lens to place an image of a document onto a rotating drum. The copy is made from this image. (a) What kind of lens is used? Should it be 1 - converging, or 2 - diverging? (Gi
A puck of mass m = 1.00 kg slides in a circle of radius r = 23.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.80 kg by a cord through a hole in the table. What speed
Four balls, each of mass m, are connected by four identical relaxed springs with spring constant k. The balls are simulataneously given equal initial speeds v directed away from the center of symmet
Two long parallel wires whose centers are 21.0 cm apart are part of the same circuit. Each wire carries equal currents in opposite directions.
a. Calculate the capacitance. The resistivity of the glass is rho = 1.2 x 10^13 ohms*m , and the dielectric constant is k=5.6 . Hint: Remember that I = dQ/dt. b. Calculate amount of energy stored in
Using the approximate values of part (b), calculate the gradient of the potential along the x axis, and show that the negative gradient is equal to the x component Ex of the electric field
A 2.0 kg object has a velocity v = 4.0i m/s at t = 0. A constant resultant force F = (2.0i + 4.0j) N then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of t
You want to use an appliance designed to operate in the United States (Vrms = 120 V) and decide to build a transformer to convert the power line voltage in France to the value required by your appl