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In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find the acceleration of the sled and child.
A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle θ with the doorjamb. Wh
What would the amplitude A of oscillation of the Millennium Bridge have been on the opening day if the damping effects had been three times more effective?
A "door closer" is attached to the door and the top of the door frame. When the door is open and is at rest, the door closer exerts a torque of 4.66 M·m. What is the least force that you need
Exactly 3.0 after a projectile is fired into the air from the ground, it is observed to have a velocity = (8.6 + 4.8 ), where the axis is horizontal and the axis is positive upward. What is the hori
They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in running through a maze.
On a Friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 75.0 km/h . How much longer does the trip take?
A crystalline solid consists of atoms stacked up in a reapeating lattice structure. the atoms reside at the corners of cubes of side L=0.200nm. one piece of evidence for the regular arrangement of a
(a) If the radius of the curve is 150 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the minimum coefficient of friction between tires and road
A hypothetical AX type material is known to have a density of 2.10 g/cm 3 and a unit cell of cubic symmetry with a cell edge length of 5.7Å.
Two boat landings are 1.0 km apart on the same bank of a stream that flows at 2.2 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relativ
An aluminums container of mass 150 gm contains 250 gm of ice at -120C. Heat is added to the system at the rate of 420 joules per seconds. What is the temperature of the system after 3.5 minutes? Spe
A cannon is fired from the top of a castle wall. The cannonball is fired at a speed of 50 m/s and an angle of 30 degrees. A cannonnall that was accidently dropped from the top of the wall hits the
A car drives straight off the edge of a cliff that is 49 m high. The police at the scene of the accident observed that the point of impact is 130 m from the base of the cliff. How fast was the car t
Block 1, of mass M1= 0.550, is connected over an ideal (massless and frictionless) pulley to block 2, of mass M2. Assume that the blocks accelerate as shown with an acceleration of magnitude a= 0.35
Moe and Joe take a car trip. Moe drives at an average speed of 38 mph for the first hour and then they stop for gas for 10 minutes. After filling gas, Joe drives at an average speed of 30 mph for 40
One electron collides elastically with a second electron initially at rest. After the collision, the radii of their trajectories are 1.00 cm and 2.40 cm. the trajectories are perpendicular to a unif
A more realistic model of such a magnet can be derived by assuming a constant magnetization throughout M=kz. where k is constant and z is the main axis.
A wire carries a current of 9.8 A in a direction that make an angle of 32.4? with the direction of the magnetic field of strength 0.262 T. Find the magnetic force on a 5.4 m length of the wire.
Two air carts of mass = 0.80 and = 0.44 are placed on a frictionless track. Cart 1 is at rest initially, and has a spring bumper with a force constant of 690 . Cart 2 has a flat metal surface for a
Find maximum and minimum frequencies of sound detected by the detector, if vibration frequency of each block is 3.5Hz.(sound velocity is 330m/s).
From the damage sustained, police estimate that the car was moving at 18 at the time of the collision. They also measure skid marks 34 long. How fast was the motorist going when the brakes were firs
A 5000 lb wrecking ball hangs from a 40 ft cable of density 10 lb/ft attached to a crane. Calculate the work done if the crane lifts the ball from ground level to 40 feet in the air by drawing in th
A bullet of mass 10 g is fired with an initial speed of 281 m/s into a wooden block The bullet becomes lodged in the block, and the two slide together on the floor for a distance of 1.2 m before com
A 800-N crate is being pushed across a level floor at a constant speed by a force vector F of 310 N at an angle of 20.0° below the horizontal, as shown in the figure below. What is the coefficie