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The coefficient of static friction between his hands and the book is 0.34. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
A 47.0 g golf ball is driven from the tee with an initial speed of 52.0 m/s and rises to a height of 24.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest poin
Two charges, -Q and -4Q are a distance L apart. These two charges are free to move but do not because there is a third charge nearby. What must be the magnitude and distance of the third charge and
Is angular momentum of the block conserved? Why or why not? (b) What is the new angular speed? (c) Find the change in kinetic energy of the block. (d) How much work was done in pulling the cord?
A wire is formed into a circle having a diameter of 10.0 cm and placed in a uniform magnetic field of 3.00 mT. The wire carries a current of 5.00 A. Find (a) the maximum torque on the wire and (b) t
A mass-spring system oscillates with an amplitude of 4.10 cm. If the spring constant is 225 N/m and the mass is 574 g, determine the mechanical energy of the system.
A machine shop grinding wheel accelerates from rest with a constant angular acceleration of 2.0 rad/s^2 for 7.0 s and is then brought to rest with a constant angular acceleration of -4.7 rad/s^2.
The electron beam will go through the center of the circle. To complete the design your job is to calculate the electric field in the center of the circle as a function of the amount of positive cha
Now place a thin film of dielectric material of refractive index 1.46. By how much will this change the optical path between the slit and the centre of the screen?
How high above the ground is the highest point that the skateboarder reaches? When the skateboarder reaches the highest point, how far is this point horizontally from the end of the ramp?
If 20.0 kcal of heat are supplied to 5.00 102 g of water at 23° C, what is the final temperature of the water?
To keep a room at a comfortable 21.0°C a Carnot heat pump does 415 J of work and supplies it with 3470 J of heat. What is the temperature of the outside air?
A freezer is comprised of 1.8x1.0x0.5 m^3 volume, insulated with 5 cm thick Styrofoam. (a) At what rate must the compressor remove heat to maintain the inside at - 20 degrees Celsius with the outsid
A horizontal force of 197 N pushes a 14 kg block up a frictionless incline that makes an angle of 65° with the horizontal.
A 25 kg chimpanzee hangs from the end of a horizontal, broken branch of length L0 = 1.6 m, as shown in the figure . The branch is a uniform cylinder 4.5 cm in diameter, and the end of the branch sup
A rocket of mass 4.5 105 kg is in flight. Its thrust is directed at an angle of 53.0° above the horizontal and has a magnitude of 6.80 106 N. Find the magnitude and direction of the rockets acce
A projectile is fired straight upward at 141 m/s. How fast is it moving at the instant it reaches the tip of its trajectory? Suppose instead that it were fired upward at 45 degrees. What would be i
How does the magnitude of electrical force between a pair of charged particles change when they are brought to half their original distance of separation?
A worker drops a wrench from the top of a tower 61.0 m tall. With what velocity does the wrench strike the ground? (Assume the positive direction is upward.)
A 82.0kg crate is resting on a frictionless surface that is inclined at an angle of 25 degreesabove the horizontal. the crate is held in place by a rope that is parallel to the incline. what is the
A particle with a mass of 1.6 × 10-20 kg is oscillating with simple harmonic motion with a period of 3.5 × 10-5 s and a maximum speed of 1.8 × 103 m/s. Calculate (a) the angular f
A driver becomes lost and travels 12.0 km west, 5.o km south, and 8.0 km east. FInd the magnitude and direction of the car's displacement from the starting place.
A television set connected to a 120 V outlet consumes 81 W of power. How long does it take for 10 million electrons to pass through the TV? Let I=0.68
The pendulum of a large clock consists of a thin steel rod with a heavy weight at the end. At 20 degrees C the rod is 1.22 meters long and the clock keeps accurate time. (a) By how much does the len
Explain physically how this happpens. Also, show why a higher-than-normal frequency results if the reflector is moving toward the observer and a lower frequency if it is moving away.