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A piece of aluminum (specific heat 0.910 kJ/kg 0C) of mass 184 g at 72 0 C is dropped into a Styrofoam cup filled with 131 ml water at 20 0 C. What are the final temperatures of the water and the al
What is the speed of the two carts at the moment when their speeds are equal? How much energy is stored in the spring bumper when the carts have the same speed?
The car reaches a temperature at which it radiates energy at this same rate. Treating the car as a perfect radiator (e = 1), find the temperature in Kelvin.
In the deep ocean, a water wave with wavelength 95 travels at 12 . Suppose a small boat is at the crest of this wave, 1.1 above the equilibrium position. What will be the vertical position of the bo
At 20°C, the carbon resistor in an electric circuit connected to a 9.0 V battery has a resistance of 229 . What is the current in the circuit when the temperature of the carbon rises to 83°
What would the horizontal component of the initial linear acceleration be at this same location?
A coil of area 10 cm2 is in a uniform magnetic field of induction of magnitude 0.1Wb m-2. The field is reduced to zero in 1 ms. what is the value of the induced emf?
Four children running alongside push tangentially along the platform's circumference until, starting from rest, the merry-go-round reaches a steady speed of one complete revolution every 2.8 s. (a)
Estimate the Calorie content of 70 g of candy from the following measurements. A 15-g sample of the candy is allowed to dry before putting it in a bomb calorimeter.
The distance to the Andromeda Galaxy is estimated at about 2 x 10(6) light years. A light year is the distance traveled by light in one year; if the speed of light is 3 x 10(8) m/s, about how far is
Why is such a power supply with a large internal resistance safer than one with the same voltage, but lower internal resistance?
A 0.27 kg rod of length 95 cm is suspended by a frictionless pivot at one end. It is held horizontal and released. (a) Immediately after it is released, what is the acceleration of the center of the r
For each of the first 7 seconds of free-fall, calculate the distance that the hammer falls and its velocity at that particular moment.
A 13 g bullet traveling 222 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 162 m/s. If the block is stationary on a frictionless surface when hit, how fast does block move after the bu
The external torque is then removed, and the wheel comes to rest 120 s later. (Include the sign in your answers.)(b) Find the frictional torque, which is assumed to be constant.
Conceptual problem: a scalloped hammerhead shark swims at a steady speed. What is the magnitude of the emf induced between the two sides of the shark's head?
A rectangular barge 5 m long and 2 m wide floats in fresh water a.) find how much deeper it floats when its load is a 400 kg horse. b.) if the barge can only be pushed 20cm deeper into the water be
The rms speed of the molecules in 1.8 of hydrogen gas is 1600 m/s. What is the total translational kinetic energy of the gas molecules?
Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on flint glass (n = 1.66) that will cause destructive interference.
A 1300-{rm kg} car rolling on a horizontal surface has speed v = 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.8 m.
a 92 kg water skier floating in a lake is pulled from rest to a speed of 12 m/s in a distance of 25 m. what is th net force exerted in the skier, assuming the acceleration is constant.
Amber,Samantha and Tena want to do the ultimate crash test.They set up a ramp with 7 books and run a 800g car down the ramp.The velocity of the car at the end of the ramp is 4.8 m/s. If the 800g ca
What are the forces that act on parts of the standard sewing machines. What other physic mechanisms are involved in a sewing machine?
A test charge (q0 = -9.80 x 10-8 C), with a mass of 1.20 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 0.20kg billiard ball traveling at a speed of 15 m/s strikes the side rail of a pool table at an angle of 60 degrees. If the side rail rebounds at the same speed and angle what is the change in it