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A 73.0 kg person is standing inside an elevator. The elevator is going from the 12th floor to the 1st floor of a tall building. At a certain moment the elevator is moving at a speed of 5.30 m/s and is changing speed at a rate of 1.40 m/s2.
a) What is the force of gravity acting on the person if the elevator's speed is increasing?
b) What is the net force acting on the person if the elevator's speed is increasing?
c) What is the normal force acting on the person if the elevator's speed is increasing?
d) What is the force of gravity acting on the person if the elevator's speed is decreasing?
e) What is the net force acting on the person if the elevator's speed is decreasing?
f) What is the normal force acting on the person if the elevator's speed is decreasing?
A 73.0 kg base runner begins his slide into second base when he is moving at a speed of 4.1 m/s. The coefficient of friction among his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base.
A 4.00-kg block of ice is placed against a horizontal springthat has a force constant k=200 N/m and is compressed 0.025m. Calculate the work done on the block by the spring during the motion of the block from its initial position
An electrical motor can accelerate a ferris wheel whose moment of inertia is 20,000 kg-m^2 from rest to 10 rev/min in 12 sec. When the motor is turned off, the ferris wheel slows down from 10 to 8 rev/min in 10 sec due to frictional losses.
A large truck collides head-on with a small car. how do the forces acting between the truck and car compare during the collision
The x component of the velocity of an object vibrating along the x-axis obeys the equation Vx(t) = (0.445 m/s) sin [(25.4 rad/s) t + 0.223]. What is the amplitude of the motion of this object
What is the kinetic energy of α particle while it reaches the other plate? The distance between the plates is 33 cm.
What current is required in the windings of a long solenoid that has 1150 turns uniformly distributed over a length of 0.380 m in order to produce a magnetic field of magnitude 1.00 AcA??c 10-4 T at the center of the solenoid?
Two hockey pucks of equal mass approach each other head-on with equal speeds of 8.4 m/s. They collide and one puck leaves the collision with a speed of 6.4 m/s. What is the speed of the other puck after the collision?
An unknown liquid fills a cubical container of side length of 15cm. The mass of the liquid (excluding the container) is 3.11 Kg. What is the absolute pressure of the container
q. a certain toaster has a heating element made of nichrome resistance wire. when the toaster is first connected to a
Explain how you might use the concept of beat frequency to tune a musical instrument using tuning forks. Would this method work better for an instrument that is slightly out of tune or an instrument that is completely out of tune?
A car with mass of 1000.0 kg accelerates from 0 m/s to 40.0 m/s in 12.0 s. Ignore air resistance. What is the average mechanical power output of the engine
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