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A child is sliding on a sled at 1.3 m/s to the right. You stop the sled by pushing on it for 0.70 sin a direction opposite to its motion. If the mass of the child and sled is 40 kg, what is the magnitude of the average force you need to apply to stop the sled? Use the concepts of impulse and momentum.
Relative to waiting line models: a. What is meant by the terms single-channel system and multiple-channel system? If a crew offour workers operates as a team in servicing a customer, how many chan- nels does the system have?
A sphere with radius 0.185m has density p that decreases with distance r from the center of the sphere according to p=3250 kg/m^(3) - (8750 kg/m^(3))r. Find total mass of the sphere
A 2500-kg sport utility vehicle travelling at 92 km/h can be stopped in 0.25 s if it hits a concrete wall. Assume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash, and..
A generator of frequency 2500 Hz drives a series RLC circuit with an emf amplitude of 120 V. The resistance is 4.1 , the capacitance is 1.60 µF, What is the current amplitude
An object at rest in a coordinate frame suddenly explodes into three parts of equal mass m. Two parts move away at right angles to each other and with equal speeds |v|.
Suppose you have a spring-loaded projectile launcher. Aim it straight upwards, compress the spring 1 cm, then launch a projectile from rest. that it rises 20 cm above the end of the spring. If you repeat this experiment, but instead compress the s..
A ladder with a mass of 16 Kg is placed on a frictionless vertical wall, see fig. A 75 Kg person climbs up the ladder but notices the ladder slipping. what percent of the length of the ladder did the person climb
A vertebra is subjected to a shearing force of 445 N. Find the shear deformation, taking the vertebra to be a cylinder 3.00 cm high and 4.00 cm in diameter
a block weighing 62.5 n rests on a plane inclined at 25.0deg to the horizontal. a force f is applied to the object at
question a cubic meter of copper has a mass of 8930kg. the block of copper is lowered into a lake by a strong cable
A quantity of heat is removed from a hot reservoir at absolute temperature T and then is added to a cold reservoir at absolute temperature T/2. The cold reservoir experiences an entropy increase S. What is the change in the entropy of the universe..
On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.5 × 103 W/m2. What is the electromagnetic energy contained in 5.0 m3 of space
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