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A curve of radius 50.9 m is banked so that a car traveling with uniform speed 64 km/hr can round the curve without relying on friction to keep it from slipping to its left or right. The acceleration
A sledge weighs 1400 lb. it is oulled on level snow by a dog team exerting a horizontal force on it. The coefficent of kinetic friction between sledge and snow is 0.05. how much work is done by the
A hotel elevator ascends 160 m with a maximum speed of 5.6 m/s. Its acceleration and deceleration both have a magnitude of 1.0 m/s2. (a) How far does the elevator move while accelerating to full spe
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine, as shown in the figure. If his arms are capable of exerting a force of 1700 N on the vine, what is the maximum speed he can t
A hiker leaves base camp and hikes the following routes over a two day period. The first day she travels at a 45 degree north of west for 20 km, she then sets up camp for the night. On day two she t
A 100 kg block attached to an ideal pulley with a block of unknown mass on the other end takes 8.5 secs to reach the floor after being released from rest. It falls 1m. What is the mass ofthe unknown
A loudspeaker of mass 21.0 is suspended a distance of = 1.40 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.9
Two cars are initially 279km apart and traveling toward each other on a straight stretch of freeway. One car is moving a 38 m/s and the other is moving at 75 m/s. In how many seconds will they pass
Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors. In the figure an electron with an initial speed of 6.60×10^6 is projected along the axis midway between the def
A rocket is fired at a speed of 75.0 m s from ground level at an angle of 60 degrees above the horizontal, the rocket is fired toward an 11 m high wall located 27 m away by how much does the rocket
In this same time, what is the vertical displacement of the electron? Treat up as positive.
A child slides down a slide with a 27° incline, and at the bottom her speed is precisely two-thirds what it would have been if the slide had been frictionless. Calculate the coefficient of kinet
A 106 kg chesterfield is pushed up a frictionless ramp at a constant speed by a delivery person. If the ramp is inclined at 28.3° to the horizontal, what horizontal force must the delivery person
A 30.0 kg packing case is initially at rest on the floor of a 1500 kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30 and the coefficient of kinetic fri
An emf is induced in a conductin loop of wire 1.14m long as its shape is changed from square to circular. Find the average magnitude of the induced emf if the change in shape occurs in 4.31s and the
This situation is like that of a car on a curve that is banked at an angle of 26°. If she tries to make the turn without slowing down, what is the minimum distance from the seawall that she can
A pilot, whose mass is 69.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 265 m/s and that the radius of the loop-the-loop is 3.579 km. What is the appar
An electron is accelerated from rest through a voltage of 420 V and then enters a region of constant magnetic field with the magnetic field perpendicular to the velocity of the electron. If the elec
A gun is fired horizontally at a block of wood, which is initially at rest on a horizobntal floor. The bullet becomes imbedded in the block, and the impact causes the system to slide a certain dista
A banked circular highway curve is designed for traffic moving at 61 km/h. The radius of the curve is 199 m. Traffic is moving along the highway at 48 km/h on a rainy day. What is the minimum coeffi
At the moment the stone is overhead, the stone is released. The magnitude and direction of the velocity of the stone when it leaves the circular path is ?
(a) sketch a vector diagram showing the components of its acceleration, (b) determine the magnitude of its radial acceleration, and (c) determine the speed and velocity of the ball.
If the slide contains a 2.4 cm high object, what is the height of the image of the object?
A mass of 3.0 kg rests on a smooth surface inclined 28 above the horizontal. It is kept from sliding down the plane by a spring attached to a wall. The spring is aligned with the plane and has a spr
You then maintain a constant speed of 65 mph. You pass the patrol car 16 seconds after you initially applied the brakes and are relieved that he doesn't pull out after you. How far away was the highwa