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Question1
A rocket with mass M is fired vertically upward. At an instant it reaches an altitude of 800m and a speed of v=350 m/s, it explodes into 3 fragments. One fragment with mass 1/2M moves upward with the speed of v1=400m/s following the explosion. The second fragment with mass 1/4M has the speed of v2= 260 m/s moving east after explosion. What's the third fragment right after the explosion?
Question2
Two window washers, Bob and Joe, are on a 3.00 m long, 325 N scaffold supported by two cables attached to its ends. Bob weighs 810 N and stands 1.00 m from the left end. Two meters from the left end is 500 N washing equipment? Joe is 0.500 m from the right end and weighs 870 N. known that the scaffold is in rotational and translational equilibrium, what are the forces on each cable?
A car of mass 2000kg is lifted up a a distance of 30m by a crane in 1 min. A second crane does the same job in 2 min. Do the crane consume the same or diffrent amounts of fuels
Two meters from the left end is the 500 N washing equipment. Joe is 0.500 m from the right end and weighs 920 N. Given that the scaffold is in rotational and translational equilibrium, illustrate what are the forces on each cable?
a proton is rotating in a 7.19 * 10^ -11 m radius circle with a frequency of 5 * 10 ^15 Hz, How large is the resultant magnetic field
An elevator is accelerating upward at 1.8m/s^2. Someone is standing on a bathroom scale in the elevator, and it reads 180lb. calculate the person's true weight
A block of mass .250 kg traveling at (1.0 m/s)y hits a second block with a .375 kg mass travelling at (1.2m/s)x, What is the velocity of the 1st blcok after they hit each other
You are making a diffraction grating that is required to separate the two spectral lines in the sodium D doublet, What is the minimum number of lines you should have on the grating
When a high speed passenger train traveling at 113 km/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D = 642m ahead.
A 4 cm radius hose pumps out gasoline at a speed of 2 m/s in to an underground tank. what is the volume of the tank
A package is dropped out of a helicopter, which is moving upward at 10m/s at a constant rate. how high above the ground was the package when it was dropped
A point charge of +6.3? C is located 0.31 m from a second point charge of -4.8? C. What is the absolute magnitude of the force on each charge?
A 1120 kg four door sedan hits a 1420 kg minivan that is at rest. The two cars lock together and skid 12.0 m on a level surface before stopping. what is the frictional force acting on the two cars
A 15 kg brick rests on a roof that is at an angle of 40º to the horizontal. What is the component of the force into the surface of the roof
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