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A 12.0-{\rm kg} shell is launched at an angle of 55.0 ^\circ above the horizontal with an initial speed of 150 {\rm{ m/s}}. When it is at its highest point, the shell exploded into two fragments, one three times heavier than the other. The two fragments reach the ground at the same time. Assume that air resistance can be ignored. If the heavier fragment lands back at the same point from which the shell was launched, where will the lighter fragment land and how much energy was released in the explosion?
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, What is the initial kinetic energy of the car
An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 690 K. If the initial pressure is 1.10 105 Pa. Find the change in the internal energy
Two boxes (m1 = 46.0kg and m2 = 29.0kg ) are connected by a light string that passes over a light, frictionless pulley. Find the acceleration of each box
a 100 ohm resistor, a 0.100micro F capacitor, and a 300mH conductor are connected in series to a voltage source with amplitude 240 V, hat is the maximun voltage across the capacitorat resonance
A rocket is launched at an angle of ? = 46° above the horizontal with an initial speed vi = 50 m/s, What is the rocket's total time of flight
A circuit consists of a 259- resistor and a 0.260-H inductor. Determine the phase angle between the current and the voltage of the generator. Note: The ac current and voltage are rms values and power is an average value unless indicated otherwise
If a person exerts 44 N of force on the back of a seat while stopping in 0.4 seconds, what is the impulse on the seat back
An astronaut weighs 275 lbs with equipment here on the surface of the earth. If he goes to a planet where the acceleration of gravity is 12.5 ft/s/s, What will be his mass be there
Suppose that at the top of its parabolic trajectory a projectile has a horizontal speed Uox. What is the radius of the circle
A machine part rotates at an angular speed of 0.48 rad/s; its speed is then increased to 2.8 rad/s at the angular acceleration of 0.61 rad/s2.
Suppose that the sound level of a conversation is initially at an angry 72 dB and then drops to a soothing 50 dB. determine the initial and final sound intensities
A uniform plank of length 4.7 m and weight 221 N rests horizontally on two supports, with 1.1 m of plank hanging over the right support. To what distance x can a person who weighs 440 N walk on the overhanging part of the plank before it just begi..
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