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A 40.3-cm diameter disk rotates with a constant angular acceleration of 2.50 rad/s2. Find the linear velocity and tangential acceleration of P at t = 2.30 s
The strongest person in the world lifted th read end of his car a mass of 615 kg a verticle distance of .24 meters. How much work did he do to life the car
At the top of a building with a height of 70 m, a ball is thrown vertically upward at time t = 0 with an initial velocity of 12.0 m/s. find the time at which the ball reaches its highest point
29.0g of copper pellets are removed from a 300?Coven and immediately dropped into 110mL of water at 23.0?C in an insulated cup. What will the new water temperature be
Suppose a crate of mass 8.4 kg is placed on the plank in the figure below at a distance x = 8.3 m from the left end. find the forces exerted by the two supports on the plank
A student at the top of a building throws a ball straight upward with an initial speed v0. How do the final velocities of the balls compare when they reach the ground
A Brayton-cycle heat engine follows the cycle shown in the figure. The heat input from the burning fuel is 2.0 MJ per cycle. Determine the engine's thermal efficiency by explicitly
A group of students have measured the time it takes for a cart to travel some distance along a level track. What is the best estimate of the relative error in their determination of the cart´s s
The water skier there has a mass of 66.0 kg. Find the magnitude of the net force acting on the skier when she is accelerated from rest to a speed of 14.0 m/s in 9.20 s
A galvanometer has a coil resistance of 48.0 ?. It is to be made into a voltmeter with a full-scale deflection equal to 100.0 V. what size resistor should be placed in series with the galvanometer
The atmosphere of the sun consists mostly of hydrogen atoms (not molecules) at a temperature of 6000 K. What are the average translational kinetic energy per atom
A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface. If the cart accelerates at m/s^2, then what is the work done by the force of friction
Two identical cars (m = 1350 kg) are traveling at the same speed of 18.9 m/s. What is the magnitude of the total momentum of the two cars
What is the angle of incidence in air of a light ray whose angle of refraction in glass is half the angle of incidence? Assume the refractive index of glass is 1.50
A girl is using a rope to pull a box that weight 300 N across a level surface with constant velocity. what is the normal force of the floor on the box
A 100 kg crate is pushed at constant speed up the frictionless 31° ramp shown in the figure. What horizontal force F is required
A force accelerates a body of mass M. The same force applied to a second body produces three times the acceleration. what's the mass of the second body
A 15-kg block rests on a level frictionless surface and its attached by a light string to a 5.0-kg hanging mass, What is the tension in the connecting string
The surface between a 12kg block , the 16kg wedge and between 16 kg wedge and the horizontal plane are smoothe, What is the force F which must be exerted on the 16 kg block in order that the 12 kg blo
4 lbm of water is in a volume of 10.0 ft3 at 60 psi. The water undergoes an isobaric change of state until the temperature is 500°F. Find the temperature at the initial state
An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50s. what is the average speed of the object
If a curve with a radius of 83 m is properly bamked for a car traveling 70 km/h, what must be the coefficient of static friction for a car not to skid
A 2.0-cm-diameter spider is 1.50m from a wall. Determine the focal length of a lens that will make a half-size image of the spider on the wall
Tarzan swings on a 30.0?m?long vine initially inclined at an angle of 370 with the vertical. What is his speed at the bottom of the swings if he starts from rest
Space debris left from old satellites and their launchers is becoming a hazard to other satellites. How much energy in joules is generated by the collision