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32g of copper pellets are removed from a 300 degrees C oven and immediately dropped into 120 mL of water at 25 degrees C in an insulated cup. What will the new water temperature be?
What is the minimum coefficient of friction between tires and road that will allow cars to take the turn without sliding off the road? (Assume the cars do not have negative lift.)
At a certain point in a horizontal pipeline, the water's speed is 2.50 m/s and the gauge pressure is 1.70×10^4 Pa. Find the gauge pressure at a second point in the line if the cross-sectional
A uniform rod AB 3m. long weighing 3kg is held horizontally by two strong vertical strings at its ends. Make the free body diagram of rod & (b) Find the tension in two strings"
A refrigerator with a coefficient of performance of 1.99 absorbs 3.96×10^4 J of heat from the low-temperature reservoir during each cycle.
A whistle of frequency 650 Hz moves in a circle of radius 69.0 cm at an angular speed of 12.0 rad/s. Use 343 m/s for the speed of sound in air. What are the lowest and the highest frequencies heard
A 51.0kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 250N . For the first 10.5m the floor is frictionless, and for the next 10.5m the coefficient of frict
Starting with the general energy balance and explaining what terms are zero or cancel, determine the power in kW needed.
A 2kg rock is released from rest at a height of 29m. ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following hei
A 225-kg crate is pushed horizontally with a force of 685 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
The water flows through a 3-inch inside diameter tube at 40 lb/second. Starting with the general energy balance. Determine the power that is required by the pump in hp?
A bat emits a sound whose frequency is 96 kHz. The speed of sound in air at 20.0° C is 343 m/s. However, the air temperature is 35° C, so the speed of sound is not 343 m/s. Assume that air
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80% of its normal
A 75 kg snowboarder has an initial velocity of 5 m/sec at the top of a 28 degree incline. after sliding down the 110 m incline which has a kinetic coefficient of friction of 0.18, the snowboarder ha
an electric field with a magnitude of 2.8 E 4 N/C at a certain location, points due south. If a charge of -4.0 E -6 C is brought to the location, what is the electrostatic force that acts on t
A ladder 6.80 m long leans against the side of a building. If the ladder is inclined at an angle of 80.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the
How much work is done by gravity when a pine cone (of mass 50g) falls from the top of a tree, 9 m high?
A cowboy at a ranch fills a water trough that is 1.4 m long, 58 cm wide, and 40 cm deep. He uses a hose having a diameter of 2.5 cm, and the water emerges from the hose at 2.7 m/s. How long does it
How far are you from the intersection when you begin to apply the brakes? What acceleration will bring you to rest right at the intersection? How long does it take you to stop?
6m steel wire with a diameter of 1.3m has a 35kg mass suspended on it, how much will it stretch under the load?
An outfielder throws a 1.87 kg baseball at a speed of 87 m/s and an initial angle of 26.9. What is the kinetic energy of the ball at the highest point of its motion?
A 1.00 102-kg crate is being pushed across a horizontal floor by a force that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.250. What should be the magni
A 3000 flask is initially open while in a room containing air at 1.00 and 20. The flask is then closed and immersed in a bath of boiling water. When the air in the flask has reached thermodynamic e
You drive at that speed for the first 100 km, but then construction work forces you to slow to 45 km/h for 40 km. What would be the least speed needed for the rest of the trip to arrive in time for
A 0.252 kg mass is attached to a spring and executes simple harmonic motion with a period of 0.29 s. The total energy of the system is 2.2 J. Find the force constant of the spring.