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A toy rocket engine lifts a mass of 4.5 kg to a height of 15.0 meters. At this height, the rocket is moving at 26.7 m/s. How much work was done by the rocket engine?
For a camera equipped with a 51-mm focal-length lens, How far is the object from the image on the film
An AC generator with a frequency of 120 Hz and an rms voltage of 20 volt is connected in series with 12 k(omega) resistor, What are the rms and maximum current in this circuit
The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.19 is suspended within a large evacuated enclosure whose walls are at a temperature of 285.0 . What power input is needed to maintain the sphere at a temperature of 2500.0 i..
A hollow spherical shell has mass 8.05kg and radius 0.225m. What is the kinetic energy of the shell after it has turned through 6.25rev
Object A has a position as a function of time given by A(t) = (3.00 m/s)t + (1.00 m/s2)t2, What is the distance between object A and object B at time t = 4s?
The acceleration due to gravity on the surface of the moon is about g/ 6. If a pendulum has a period T on earth what will its period be on the moon?
A thin, uniformly charged ring of radius a = 10cm carries a total electric charge Q=3.6microCoulombs and rotates with angular speed w = 170rad/s counterclockwise about the z-axis
5 moles of an ideal gas, initially at P=105 Pa and V=3m3, expand adiabatically until the volume is doubled, How much work was done in the adiabatic step
A 10cm long thin glass rod is uniformly charged to +50nC. A small plastic bead, charged to -5.3nC,is 4.4cm from the center of the rod
A thermos contains 159 cm3 of coffee at 93.7 °C. To cool the coffee, you drop two 13.2-g ice cubes into the thermos. What is the final temperature of the coffee
you're designing a prosthetic ankle that includes a miniature electric motor containing a 150-turn circular coil 15 mm in diameter. The motor needs to develop a maximum torque of 3.1 mN-m. what current do you need in your motors coil
A thermos contains 141 cm3 of coffee at 92.9 °C. To cool the coffee, you drop two 10.4-g ice cubes into the thermos. What is the final temperature of the coffee
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