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A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 79.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.00 m/s2 until it reaches an altitude of 910 m. At that point its engines fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s2. (You will need to consider the motion while the engine is operating separate from the free-fall motion.)
(a) How long is the rocket in motion above the ground?
s
(b) What is its maximum altitude?
km
(c) What is its velocity just before it collides with the Earth?
m/s
In constructing a large mobile, an artist hangs an aluminum sphere of mass 5.3{\rm kg} from a vertical steel wire 0.42{\rm m} long and 3.0×10?3{\rm cm^2} in cross-sectional area. Compute the elongation strain for the bottom wire
A wave crest passes an observation point followed by a second crest. The time between crest is a period of 168.818 seconds. If the wave is traveling at a speed of 154.167 m/s, how long are the wavelengths?
If a transformer steps the voltage down from 8800 V (at the pole) to 120 V (at the building) and it is to deliver 1000 kW to the building at 80% efficiency, what is the ratio of primary turns to secondary turns
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Transverse waves travel with a speed of 18 m/s in a string under tension of 5 N. What tension is required for a wave speed of 27 m/s in the same string.
A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.60 m/s2 over the distance of 20.80 cm. It then decelerates at the constant rate of 1.03m/s2 (because of friction), until it again comes to..
A capacitor consists of square conducting plates 28cm on a side and 5.5mm apart, carrying charges ± 1.8?C, Find the stored energy
A velodrome track is banked so that a bicycle traveling at 62.8 km/h will have no tendency to slip to either side when traveling on the path that has a radius of curvature of 79.0 m
A 1.00 liters vessel contains a monatomic gas under STPconditions. if 32.0J OF ENERGY is added to the gas (at constant volume) what is the new temperature of the gas
A laser pulse has an energy of 16 J and a beam radius of 2 mm. The pulse duration is 13 ns and the energy density is constant within the pulse. What is the total energy density within the pulse
how much time passes before the brick lands on the ground. If the wind speed is 26 mph, find the velocity of the plane in still air.
What force does the water exert on the man. explain how far does the tongue reach.
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