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An athlete at the gym holds a 2.4 kg steel ball in his hand. His arm is 76 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the
A 240 g , 23.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1500 rpm in 5.00 ?
What is the maximum speed with which a 1300- car can round a turn of radius 76 on a flat road if the coefficient of static friction between tires and road is 0.45?
If the bullet-block system compresses the spring by a maximum of 80.0 cm, what was the speed of the bullet at impact with the block?
Calculate its average speed. Calculate its average velocity for the entire trip, using "away from the trainer" as the positive direction.
On a hot summer day, a young girl swings on a rope above the local swimming hole. When she lets go of the rope her initial velocity is 2.25 m/s at an angle of 35 degrees above the horizontal. If she
Condensation occurs on a bathroom window at a rate of 0.5kg per hour. If the bathroom air is at 26 Deg C and fully saturated with water vapour, calculate approx the rate of heat transfer on to the w
A 34 kg child sits in a swing supported by two chains, each 3.1 m long. If the tension in each chain at the lowest point is 283 N, find the child's speed at the lowest point.
What velocity would a proton need to circle Earth 1000 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 10-8 T?
A rocket of total mass 2630 kg is traveling in outer space with a velocity of 167 m/s. To alter its course by 38.0^circ, its rockets can be fired briefly in a direction perpendicular to its original
A 1.0 kg stone is being whirles at constant speed of 12 m/s in a circle, held on a frictionless surface by a steel wire which is horizontal. The wire is 4.0 m long and its radius is 1.0 mm. Find th
A rock is thrown vertically upward from ground level at time t = 0. At t = 1.76 s it passes the top of a tall tower, and 1.23 s later it reaches its maximum height. What is the height of the tower?
A 29.0 kg child on a 1.00 m long swing is released from rest when the ropes of the swing make an angle of 27.0° with the vertical. Find the child's speed at the lowest position.
A flagpole of length 9 m and mass 35 kg is hinged at one end, where it is connected to a wall as sketched below. The pole is held up by a cable attached to the end. Find the tension in the cable. (A
A low-mass spring is connected between the object and a glange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the sliding object. Wh
Imagine a spider with mass 7.0 x 10-5 kg moving downward on its thread. The thread exerts an upward force on the spider of 1.2 x 10-4 N. What is the acceleration of the spider?
Calculate the frequency of an ultrasound signal if its velocity is 1500 m/s and the wavelength is 7.6 x 10^-3cm
An 76 quarterback jumps straight up in the air right before throwing a 0.43 football horizontally at 19 .How fast will he be moving backward just after releasing the ball?
A wheel starts from rest on a flat circular track and attains an acceleration of 1.7 m/s2. It completes a quarter distance on a track before going off the track. Calculate the coefficient of static
A 89.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the
Particle 1 has a velocity v= 2 m/s and a mass m= 2 kg. this particle collides with particle 2 of mass m= 6 kg, which is at rest, and then two particles stick together. the speed of the conglomerate
A uniform block of height 0.330 m, floats in glycerin of density 1260 kg/m3. The bottom of the block is 0.2748 m below the surface of the glycerin. What is the density of the block?
Name the three important rays that are used in the ray diagram to determine the image location of an object
When the 4.6 kg weight is moving with a speed of 1.7 m/s, what is the kinetic energy of the entire system?
A dump truck is being filled with sand. The sand falls straight downward from rest from a height of 3.50 m above the truck bed, and the mass of sand that hits the truck per second is 35.0 kg/s. The