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A rock with a mass of 6.0kg is being whirled in a horizontal circle on the end of a rope 1.6m long. if the seed of the rock is 2.7 m/s, what is the magnitude of the centripetal acceleration?
Determine the distance between Polaris and Earth in Meters. Polaris is 431 ly from Earth. The speed of light is 3.0 x 10^8 m/s.
Water flows at 5.0;{rm L}/{rm s} through a horizontal pipe that narrows smoothly from 10 cm diameter to 5.0 cm diameter. A pressure gauge in the narrow section reads 50 kPa. What does the other pre
The distance from a point on the surface of Earth to a point on the surface of the moon is measured by aiming a laser light beam at a reflector on the surface of the moon and measuring the time req
If the rectangular barge is 2.50 m by 24.0 m and sits 0.800 m deep in the harbor, how deep will it sit in the river?
A truck travels beneath an airplane that is moving 120 km/h at an angle of 49 degrees to the ground. how fast must the truck travel to stay beneath the airplane?
What is the typical rotational frequency for a molecule like at room temperature ()? Assume that for this molecule is . Take the atomic mass of to be . Express numerically in hertz, to three signifi
Five people are playing tug-of-war. Anders and alyson pull to the right with 45 N and 35 N, respectively. Calid and Marisol pull to the left with 53 N and 38 N, respectively. with what force and in
A 0.05-kg bullet traveling at 120 m/s tears into a slab of thick wood. The wood exerts a constant retardation (negative acceleration) of magnitude 8000 m/s2. How long will it take the bullet to com
A 3210 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 5.13 m before contacting the beam, and it drives the beam 5.43 cm into the ground before coming to rest.
Estimate the spacing between the centers of neighboring atoms in a piece of solid aluminum, based on a knowledge of the density (2700 kg/m3) and atomic mass (26.9815 u) of aluminum.
A string under a tension of 59 N is used to whirl a rock in a horizontal circle of radius 3.9 m at a speed of 23.9 m/s. The string is pulled in, and the speed of the rock increases. When the string
An electron passes through a slit of width 7.89 10-8 m. What is the uncertainty in the electron's momentum component in the direction perpendicular to the slit but in the plane containing the slit?
The maximum tension that a 0.5m string can tolerate is 14N. A 2.5kg ball is attatced to the string being whirled in a vertical circle. What is the maximum speed the ball can have at the top of the
Block A, with a mass of 4 kg, is moving with a speed of 2.0m/s while block B, with a mass of 8 kg, is moving in the opposite direction with a speed of 3m/s. Calculate the center of mass of the two b
A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50
A space vehicle is orbiting Earth in a circular orbit with a radius of 10,300,000 m. What is the minimum increase in speed that is needed for the vehicle to escape Earth's gravitational field? The
A mechanic pushes a(n) 2900 kg car from rest to a speed of v, doing 4367 J of work in the process. During this time, the car moves 26.8m. Neglect friction between car and road. Find the speed v.
If the coefficient of friction between the ladder and ground is 0.41, what is the mass of the heaviest person who can safely ascend to the top of the ladder?
A 65Kg ice skater pushes off his partner and accelerates backwards at 1.3m/s^2. if the partner accelerates in the opposite direction at 2.0m/s^2, what is the mass of the other skater?
A curve of radius 54 m is banked for a design speed of 90 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Conside
You pull your little sister across a flat snowy field on a sled. Your sister plus the sled have a mass of 31 kg. The rope is at an angle of 30 degrees to the ground. As you pull with a force of 30 N
The force she exerts is 43 N at an angle of 58° above the horizontal. What is the work she does on the bag, the force friction does on the bag and the coeffecint of kinetic friction.
What is meant by the focal length of a lens or mirror? What is the difference between the focal length of a lens and the image distance?
When the solenoid is connected to an ideal (no internal resistance) 2.73-V battery, the magnitude of the magnetic field inside the solenoid is found to be 5.83 10-3 T. Determine the radius of the wi