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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. (b) If the initial mass is 2.08 x 10^6 and the final mass is 6.78 x 10^4 kg, find the final speed of the spacecraft (assume the initial speed is zero and any gravitational fields are small enough to be ignored). (c) 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).
In outer space, a baseball of mass m = 0.140 kg travels at velocity vi = (2.00 m/sec, 5.00 m/sec, 0); let the z-axis be up out of the plane of paper. calculate the average interaction force on the stick
A 1 cm long section of patellar ligament stretches to 1.001 cm when it is subjected to a tensile force of 10,000 N. What is the strain in this segment of ligament
Water is being pumped 100 meters up a hill through a hose at a rate of .012m^s/s. what is the water pressure at the bottom of the hose
A uniform electric field of magnitude 226 V/m is directed in the negative y direction. Through what potential difference did the charge move
The 4.83- kg weight that drives the time mechanism of a grandfather clock descends 27 cm in exactly 24 hours.
A spring can be compressed 2.0 cm by a force of 329 N. A block with a mass of 9.0 kg is released from rest at the top of a frictionless incline as shown. What is the speed of the block just as it touches the spring
An AC adapter for a laptop computer unit uses a transformer to reduce the line voltage of 110 V (rms) to a voltage of 18.5 V. What is the rms current delivered to the transformer
a uniform 12.0kg ladder is 4.0m long and is placed against a frictionless wall at 30 degress. find the frictionless force at the floor necessary to maintaain equilibrium
for a particle in a one demention box, the ground state wave function is: psi=(2/L)^1/2 sin(piX/L), What is the probebility that the particle is in the right-hand half on the box
The 40 kg man in the roller coaster car is sitting on a bathroom scale. If he is travelling at 35.3 m/s at the point shown and the radius of vertical coaster track is 53 meters, to the nearest newton what does the scale read?
A parallel beam of light containing red (660 nm) and violet (410 nm) wavelengths goes from diamond to water, striking the surface between them at a 19° incident angle
the current in a 120 v reading lamp is 3.0 a part a if the cost of electrical energy is 0.075 per kilowatt-hour how
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