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A parachutist with mass 86.0 kg jumps from an airplane traveling at a speed vi=112 km/hr at a height H=2570 m. He lands with a speed of vf=5.21 m/s. What is the change in mechanical energy of the earth-parachutist system from just after the jump to just before landing
_________?J ( ± 2E4 J)
The downward acceleration of a 74-kg stuntwoman near the end of a fall from a very high building is 5.5m/s2
The pilot of an aircraft wishes to fly due west in a 37.70 km/h wind blowing toward the south. The speed of the aircraft in the absence of the wind is 191 km/h.
The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1465 W/m2. What is the average energy density
A car starts from rest and travels for 10s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform negative acceleration of -2.0 m/s2.
The G string on a violin has a fundamental frequency of 196 Hz. It is 33.0 cm long and has a mass of 0.500 g. what is the effective length of her string
The position of a particle is given by x = 4.4 cos pt, where x is in meters and t is in seconds. Find the speed and acceleration of the particle when x = 2.3 m
For 140 keV gamma rays, the mass attenuation coefficients for hydrogen and oxygen are 0.26 and 0.14 cm^2/g, respectively. What is the mean free path in water at this energy
A heat engine that is 58.6% efficient does 235.4 kJ of work. How much thermal energy input was required to perform this work
A syringe has an area of 0.7 cm2 at its barrel and then narrows down to an area of 0.15 mm2 at the needle end. If a force of 4.6 N is applied to the syringe, what is the force produced at the tip of the needle?
An incandescent light bulb is rated at 100 W when the applied voltage is 120 V. find the resistance of the bulb when it is operating
A 250, 35-cm-diameter turntable rotates on frictionless bearings at 60. A 25 block sits at the center of the turntable. A compressed spring shoots the block thoroughly outward next to a frictionless groove in the surface of the turntable.
Two carts on a frictionless air track are made to travel toward each other. As they collide they stick together. if the cart on the left has a mass of 250 grams and is moving at 0.2 meters per second to the right.
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