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An ac voltage is applied to a 25.0 ohm resistor so that it dissipates 500 W of power. Find the resistor's (a) rms and peak currents and (b) rms and peak voltages.
The temperature at a point 31 miles north of a station is 5.5 F cooler than at the station. If the wind is blowing from the northeast at 45mph and the air is being heated by radiation at the rate of
An object has a volume of 3.29 m^3 and a mass of 3000 kg. do you expect the object to sink or float in water? if the object were attached by a cable to the bottom of a swimming pool, what would be t
A rocket is launched and attains a speed of 5400 m/s when 62000 m above the earth. if the engines shut down, how much higher will the rocket rise before beginning its fall back toward the earth? sho
A steel rod is 2.2m long & must not stretch more then 1.2 mm when a 8.5 kN load is applied to it. Knowing that E= 200GPa, determine, (a) The smallest diameter rod which should be used, (b) The cor
A 15 kg object floating in the water has .21 of its volume above the surface of the water. What is the volume of the object?
A rocket is launched and attains a spped of 7900 m/s when 35000 m abovve the surface of the earth. If the engines then shut down , how much higher will the rocket rise before beginning its fall back
Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse the catapult receives from the rock?
A skater is spinning with his arms outstretched. He has a 2-lb weight in each hand. In an attempt to change his angular velocity he lets go of both weights. Does he succeed in changing his angular v
A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor. The maximum value of the current in this circuit is:
The Ed scale defines the perfect temperatre of a martinin to be 5 Degrees E and the boiling point of antifreeze to be 100 degrees E.
A 120-m long steel wire has a coefficient of linear exspansion of 11x10^-6 /Celcius. give its change in length as the temperature changes from 10 degrees celcius to 45 degrees celcius. show work.
Suppose 2.5 kg of 32 deg C water is mixed with 9.3 kg of 65 deg C water. if no heat is lost in this system, then what is the final temperature of the water.
A 900 kg crate is on a rough surface inclined at 30 degrees. A constant force P=7200N is applied horizontally to the crate. While this force pushes the crate a distance of 3 m up the incline, its ve
The springs are attached to a small cube and stretched to a length L of .36 m. An external force P pulls the cube a distance D=.020 m to the right and holds it there. The work done by the external f
A 600 kg car traveling at 24.5 m/s is going around a curve having a radius of 120 m that is banked at angle of 20 degrees. (a) Is the curve properly banked for the car's speed?
A 600kg car traveling at 30 m/s is going around a curve having a radius of 120m that is banked at angle of 25 degrees. The coefficient of static friction between the car's tire and the road is .3. W
The coefficient of kinetic friction for the horizontal surface is 0.400 and g=10.0 m/s^2. What is the kinetic energy of the object at the bottom of the inclined plane?
If the period of a 10m long pendulum is 18s on an asteriod, then what is the acceleration due to gravity on the asteroid? show work.
A 32.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 21.00 m. When she is partway down the slide, at a height h2 of 10.00 m, she is moving at
A spring with an 7.9-kg mass is pulled back 0.25 m. If its frequency is 3.6 Hz, then find the position, velocity, and acceleration of the mass after 0.45 s.
A) Find the potential energy stored in the spring when the mass is at its maximum displacement. B) What is the speed of the mass when it is passing through the equilibrium position?
The nucleus of a helium atom contains two protons that are approximately 2.0 fm apart. How much work must be done by an external agent to bring the two protons from an infinite separation to a sepa
An electron is moved from point A, where the electric potential is VA = -280 V, to point B, where the electric potential is VB = -362 V. What is the change in the electric potential energy?