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A spacecraft engine creates 55.1 MN of thrust with a propellant velocity of 4.88 km/s. (a) Find the rate (dm/dt) at which the propellant is expelled.
A 2.00kg block hangs from a spring. A 300g body hung below the block stretches the spring 2.00cm farther. (a) What is the spring constant? (b) If the 300g body is removed and the block is set into
A 60.0-kg person rides in an elevator while standing on a scale. The scale reads 400 N. What is the acceleration of the elevator?
Two points A and B lie 20 cm apart on a line extending radially from a point charge Q. If the potential at A is 150 V and the potential at B is 120 V, find the charge Q and the distance of point A f
What is the initial horizontal velocity of the block as it flies off the table? (assume this to be in the positive direction)
A ball and bat, approach one another each with the same speed of 2.70 m/s, collide. Find the speed of the ball after the collision. (Assume the mass of the bat is much much larger than the mass of t
A bullet (m = 0.0230 kg) is fired with a speed of 99.00 m/s and hits a block (M = 2.60 kg) supported by two light strings, stopping quickly. Find the height to which the block rises.
Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take to stop the train, if the passengers experience an average horizon
Calculate the power which the engine must deliver (to compensate for air resistance and rolling resistance) in order to maintain that speed.
In this case, the line breaks when the kinetic energy of the plane is 51.5 J. Find the magnitude of the charges.
Part A) A power plant burns coal and generates an average of 620.0 Megawatts (MW) of electrical power while discharging 979.60 MW as waste heat. Find the total electrical energy generated by the pla
The rope of a swing is 3.00 m long. Calculate the angle from the vertical at which a 83.0 kg man must begin to swing in order to have the same KE at the bottom as a 1500 kg car moving at 1.25 m/s (2
As a result, each object experiences an electrostatic force that has a magnitude of 1.01 × 10-20 N. How many electrons did it take to produce the charge on one of the objects?
A 1.30 kg box slides down a rough incline plane from a height h of 1.87 m. The box had a speed of 2.33 m/s at the top and a speed of 1.90 m/s at the bottom. Calculate the mechanical energy lost due
Calculate the change in potential energy of a 88.4 kg man when he takes an elevator from the first floor to 33th floor, if the distance between floors is 3.93 m.
(a) Determine the net force exerted on q1 by the other two charges. (b) If q1 had a mass of 1.50 g and it were free to move, what would be its acceleration?
An electron of mass 9.11x10^-31 kg has an initial speed of 2.40x10^5 m/s. It travels in a straight line, and its speed increases to 6.80x10^5 m/s in a distance of 4.80 cm. Assume its acceleration i
A train with proper length of 200m is traveling at the speed of 120km/hr. An observer on the ground sees two lightening striking the two ends of the train at exactly the same time. What is the time
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.)
A 5.0 g ice cube at -20Degree Cis in a rigid, sealed container from which all the air has been evacuated.
Three point charges lie along the y axis. A charge of q1 = -9.28 µC is at y = 6.26 m, and a charge of q2 = -7.56 µC is at y = -3.66 m. Where must the third positive charge, q3, be place
A plant falls from the windowsill of an apartment in a very tall building. If the floor of your apartment is 33.53 m above the ground, and it takes the plant 0.4760 seconds to cross your 9 ft windo
A projectile passes point A with a velocity v, upward. At some time later, the projectile passes point B, with a velocity (v/2) upward. In terms of v and the acceleration due to gravity g, (a) how l
Find the average acceleration till burnout (the time at which the propellant is used up; assume the mass flow rate is constant until that time).
How much power is required to operate the machine when the dome potential is 3.0 MV, assuming the rate of charge transfer remains constant?