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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
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