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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
At the position of the negative charge, what is the magnitude of the electric field due to the three positive charges? What is the magnitude of the attractive force on the negative charge?
A lightning bug flies at a velocity of 0.25 m/s due east toward another lightning bug seen off in the distance. A light easterly breeze blows on the bug at a velocity of 0.25 m/s. What is the resul
A projectile is launched from ground level at 100m/s at an angle of 45.0 degrees above the horizantal, and it is subject only to gravity.
If the football has a mass of 0.56 kg and the time of contact with the ball is 0.027 s, what is the force exerted by the ball on the kicker's foot?
Mercury is poured into a tall glass. Ethyl alcohol (which does not mix with mercury) is then poured on top of the mercury until the height of the ethyl alcohol itself is 129 cm. The air pressure at
A 9300 kg boxcar traveling at 20 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 10 m/s. What is the mass of the second car?
A car moving at 9 m/s crashes into a barrier and stops in 0.050 s. There is a 20 kg child in the car. Assume that the child's velocity is changed by the same amount as the car's in the same time pe
A hydrogen atom is in its n = 6 excited state. Determine, according to quantum mechanics, each of the following: The maximum value that the z component of the Lz of the angular momentum can have
Starting from rest with an acceleration of 0.37 m/s2, he covers the same distance as the ramp does, but in one-fourth the time. What is the speed at which the belt of the ramp is moving?
A test charge (q0 = -9.40 x 10-8 C), with a mass of 2.70 x 10-8 kg, is released from rest at one of the corners of the square. Determine the speed of the test charge when it reaches the center of th
A particle moving with a velocity of 1.3 m/s in the + x direction is given an acceleration of 0.10 m/s2 in the + y direction for 3.2 s. Find the final speed of the particle.
How high does the top of the ice block float above the water level?
Compare the speed of the light beam relative to the ground when the train is at rest and when it is moving. How does the behavior of the light beam differ from the behavior of a bullet fired forward
A parallel-plate capacitor has a plate area of 0.2 m2 and a plate separation of 0.1 mm. To obtain an electric field of 2.0 × 106 V/m between the plates, the magnitude of the charge on each pla
Mary weighs 521 N and she walks down a flight of stairs to a level 5.5 m below her starting point. What is the change in Mary's potential energy?
Coherent light with wavelength 602 passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 from the slits. The first-order bright fringe is a di