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A 29 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion. Once the chair is in motion, a 325 N horizontal force keeps it moving at a constant velo
A 523 kg bear grasping a vertical tree slides down at constant velocity. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on the bear? Answer in units of N.
A 15 g lead bullet is tested by firing it into a fixed block of wood with a mass of 1.05 kg. The block and the embedded bullet together absorb all the heat generated. After thermal equilibrium has
A pendulum has a length L = 1.49 m. It hangs straight down in a jet plane about to take off as shown by the dotted line in the figure. The jet accelerates uniformly, and during that time, the pendu
A spring has a spring constant, k, of 443 N/m. How much must this spring be stretched to store 27 J of potential energy?
Two trains are traveling toward each other at 30.9 m/s relative to the ground. What frequency will be heard if the wind direction is reversed?
The magnitude of a uniform electric field between the two plates is about 2 × 105 N/C. If the distance between these plates is 0.1 cm, find the potential difference between the plates.
A rectangular block of ice 7 m on each side and 1.1 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How many penguins of mass 24 kg each can
Your swimming pool is square and 4.8 m on a side. It is 3.2 m deep in the morning. If the temperature changes by 25°C during the afternoon, how much does the depth of the water increase?
Two identical point charges (q = +5.20 x 10-6 C) are fixed at opposite corners of a square whose sides have a length of 0.490 m. A test charge (q0 = -6.70 x 10-8 C), with a mass of 5.70 x 10-8 kg,
The pulley system shown in the figure is used to lift a 39 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume th
The lens is illuminated with monochromatic light (lambda vacuum = 570 nm), and a series of concentric bright and dark rings is formed, much like Newton's rings. How many bright rings are there?
An arrow is shot at an angle of above the horizontal. The arrow hits a tree a horizontal distance away, at the same height above the ground as it was shot. Use for the magnitude of the acceleration
A hard-boiled egg of mass 51.0 moves on the end of a spring with force constant 24.5 . Its initial displacement is 0.303 . A damping force acts on the egg, and the amplitude of the motion decreases
What is the magnitude of the force a + 50 mC charge exerts on a - 0.05 C charge 70 mm away?
What frequency will be heard on the other train if the wind is blowing at 30.9 m/s toward the whistle and away from the listener?
A 56 kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.0 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alt
A chair of weight 115 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 41.0 N directed at an angle of 39.0^circ below the horizontal and the
Suppose that the same pull is exerted at an angle above the horizontal. If this pull now does 65.0 {rm J} of work on the box while pulling it through the same distance, what angle does the force mak
A 1.0 cm times 1.0 cm parallel-plate capacitor has a 1.0 mm spacing. The electric field strength inside the capacitor is 1.1×105 V/m. What is the potential difference across the capacitor?
A car traveling 20.0 m/s when the driver sees a child standing on the road. She takes .80s to react, then steps on the brakes and slows at 7.0 m/s^2. How far does the car go before it stops?
A 0.25 kg length of aluminum wire is warmed 10°C by an electric current. How much heat was generated by the current?
Two objects of masses m and 3m are moving toward each other along the x-axis with same initial speed v0. The object with mass m is traveling to the left, and the object with mass 3m is traveling to
The target stands 1.65m high. The arrow will travel with a velocity of 53m/s. At what angle must he aim the arrow so that it hits the target?
A 28.0 {rm kg} block is connected to an empty 1.80 {rm kg} bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.48 and the coe