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(a) What was the magnitude of the centripetal acceleration of the rock when it was on the string? (b) What was its speed when it was on the string?
A 35.0g bullet moving at 475m/s srikes a 2.5kg bag of flour that is on ice, at rest. The bullet passes through the bag and exits it at 275m/s. How far is the bag moving when the bullet exits?
Find the length of a bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on a park bench, given that its proper length is 1.90 m.
A space station, in the form of a wheel 125 m in diameter, rotates to provide an "artificial gravity" of 3.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of r
An automobile tire is pumped up to a gauge pressure of 2.0 × 105 Pa when the temperature is 27°C. What is its gauge pressure after the car has been running on a hot day so that the tire te
A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?
A dipole with dipole moment 1.6 is oriented at 31 to a 5.0 electric field. What is the magnitude of the torque on the dipole?
A wad of wet putty of mass 0.020 kg drops vertically onto the record from above and sticks to the edge of the record. What is the angular speed of the record immediately after the putty sticks to it
In a tug-of-war between two athletes, each pulls on the rope with a force of 546 N. What is the tension in the rope? What is the absolute value of the horizontal force that each athlete exert again
A sports car crosses the bottom of a valley with a radius of curvature equal to 80 {rm m}. At the very bottom, the normal force on the driver is twice his weight. At what speed is the car traveling?
A skier of mass 66 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 75 m up a 30° slope (assumed frictionless) at a constant speed of 2.1 m/s?
Earth's atmosphere, the electric field above Earth's surface has been measured to be 150 N/C downward at an altitude of 250 m and 165 N/C downward at an altitude of 400 m. Calculate the volume char
What is the magnitude of the uniform electric field between the plates? Find the change in the electric potential energy of an electron that moves from one accelerating plate to the other one.
When two tuning forks of 132 Hz and 146 Hz, respectively, are sounded simultaneously, how many beats per second are heard? Answer in units of beats/s.
Next, a beaker of water is placed so that the iron block, suspended as in part (A), is submerged in the beaker but not touching the bottom as seen in the picture. What mass is now necessary to balan
How much water flows over victoria falls which is 128 m high, at an average rate of 1.50 × 106 kg/s. the acceleration die to gravity is 9.81 m/s2.
Determine the magnitude of the spring's displacement at an instant when the acceleration of the box is zero. What is the magnitude of the spring's displacement when the spring is fully compressed?
An alternating emf source with a variable frequency fd is connected in series with an 80.0 B resistor and a 40.0 mH inductor. The emf amplitude is 6.00 V. (a) Draw a phasor diagram for phasor VR
The angle between the beam and the cable is 90o. If the beam is inclined at an angle of q = 24.5o with respect to horizontal, what is the horizontal component of the force exerted by the hinge on th
A solid cylinder with a mass of x kg and a radius of x m starts from rest at a height of x m and rolls down a x degrees slope. what is the translational speed of the cylinder when it leaves the inc
A father racing his son has three-fifths the kinetic energy of the son, who has three-fifths of the father. What is the original speed of the father?
An oscillator with a mass of 520 g and a period of 0.900 s has an amplitude that decreases by 2.50% during each complete oscillation. If the initial amplitude is 9.60 cm, what will be the amplitude
On a frictionless, horizontal air track, a glider oscillates at the end of an ideal spring of force constant 2.52 N/cm. The graph in the figure shows the acceleration of the glider as a function of
The displacement of a certain moving body is given by
An electron with an initial speed of 5.50×105 {rm{ m/s}} is brought to rest by an electric field. What was the potential difference that stopped the electron?