Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
If I drop a 0.2kg ball from a height of 2m onto the floor, and It bounces back to a height of 1.6m. How much energy did it lose in the collision with the floor and to air resistance?
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.
The brakes of a truck cause it to slow down by applying a retarding force of 3.40 x 103 N to the truck over a distance of 920 m. What is the magnitude of the work done by this force on the truck? Is
A dolphin in 25°C sea water emits a sound directly toward the bottom of the ocean 105 m below. How much time passes before it hears an echo? (The speed of sound in sea water is 1530 m/s.)
A uniform electric field with a magnitude of 6270 N/C points in the positive x direction. Find the change in electric potential energy when a +12.5 µC charge is moved 5.16 cm in the following
A car travels around a level circular track 500 m in diameter. If the coefficient of static friction between the tires and the track is 0.7, then what is the maximum speed the car can maintain while
A 0.40 kg mass attached to the end of a string swings in a vertical circle of radius 1.8 m. At an instant when the string makes and angle of 40 degrees below the horizontal the speed of the mass is
A 200 g object tied to a string 80 cm long travels in a vertical circle of radius 80 cm. At the top of the circle the speed of the object is 4.5 m/s. What is the tension in the string at this positi
A block of mass 5.0 kg is pulled across a horizontal surface at a constant speed by a force 14 N directed at 35 degrees from the horizontal. What is the coefficient of kinetic friction between the
A distant galaxy emits light that has a wavelength of 479.2 nm. On earth, the wavelength of this light is measured to be 481.6 nm. Find the speed of the galaxy relative to the earth. (Give your answ
(a) Find the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them. (b) At what position (other than the infinitely remote ones) can the 50.0 kg object be p
Objects with masses of 200 kg and 500 kg are separated by 0.400 m. (a) Find the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them.
(a) If the vehicle has a speed of 20.0 m/s, what is the force of the track on the vehicle at the lowest point of the track? (b) What is the maximum speed the vehicle can have at point B, the highest
It has been suggested that rotating cylinders about 10 mi long and 5.0 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal ac
(a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have a radii of 0.330 m? (b) What is the angular speed of the wheels when th
A 3.00-mol sample of oxygen gas is confined to a 4.95-L vessel at a pressure of 8.06 atm. Find the average translational kinetic energy of the oxygen molecules under these conditions.
A cylinder contains a mixture of helium and argon gas in equilibrium at 170°C. (a) What is the average kinetic energy for each type of gas molecule?
Starting 2 seconds after the speeder passes, the police car accelerates at 6.0m/s^2 for 6 seconds, and then maintains constant speed until it catches the speeding car. (a) How many seconds after the
A BMW of mass 2.6 103 kg is traveling at 42 m/s. It approaches a 1.1 x 103 kg Volkswagen going 24 m/s in the same direction and strikes it in the rear. Neither driver applies the brakes. Neglect the
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 16.0 m. She pushes in a direction 20.0° below the horizontal. A 32.0-N frictional force opposes the motion of th
a) If they move at constant velocity, what is the frictional force between A and B? b) What is the maximum horizontal force that can be applied to B without A slipping?
Two 50 g ice cubes are dropped into 200 g of water in a glass. If the water was initially at a temperature of 25oC and if the ice came directly from a freezer operating at a temperature of -15oC, wh
If a storm window is installed having the same thickness of glass but with an air gap of 7.5 cm between the panes, what will be the corresponding rate of heat loss?
Suppose that he uses 1/2 liter of tap water at 59o C, and that the water falls 40 cm each shake, and the chef making 30 shakes each minute. Neglecting any heat loss to the room, how long must he sha