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Estimate the height of the shoulders above the ground and the radius of their arm reach. Draw a free body diagram of the forces acting on the dancer on the right, using T for tension and N for the n
Consider the "luggage"-pulling demonstration with Deena pulling Annie at constant speed. Write the symbolic equation for the tension as a function of pulling angle, friction coefficient, and Annie's m
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.85 V and a current of 3.0 A are induced in the coil. The w
You are trying to improve your shooting skills by shooting at a can on top of a fence post. You miss the can, and the bullet, moving at 205 m/s, is embedded 1.53 cm into the post when it comes to a
Whole lotta shakin' goin' on. Suppose an earthquake shook a shelf sideways according to x(t) = B sin (ωt) where ω = 2 π f = 2 π/ τ. Write symbolic equations for the shelf speed
Some athletes can put out as much as 700 watts in short bursts. If you could sustain such an energy output long enough to reach the top of a mountain, how much time would it take you to get there f
Which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement.
In one cycle, a steady device transfers 1.55 × 106 J of energy from a reservoir at 450 K to a reservoir at 300 K. Find the change in entropy (after one complete cycle), (a) for the device, an
A 23-g bullet traveling 285m/s penetrates a 4.5kg block of wood and emerges cleanly at 230m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet
What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Take the speed of sound to be 344 m/s.
The radius of the merry-go-round is 9 m. At what time intervals does Sheila encounter her brother, if she rides opposite to the direction of rotation of the merry-go-round?
Stone is thrown straight up from the bottom of the cliff with a speed of 27.0 . The stone and ball collide part way up. How far above the base of the cliff does this happen?
Use either trigonometry or components to find the displacement that will return Bob to his starting point by the most direct route. Give your answer as a distance. Find the direction of the displace
A uniform meter stick with a mass of 250g is supported horizontally by two vertical strings, one at the 0.0-cm mark an the other at the 90.0-cm mark.
A 53 kg skier skis directly down a frictionless slope angled at 12° to the horizontal. Choose the positive direction of the x axis to be downhill along the slope. A wind force with component Fx
What is λ2, the linear charge density of the insulating shell? What is Ex(P), the value of the x-component of the electric field at point P, located a distance 6.8 cm along the y-axis from the
A 1.38 kg object is held 1.40 m above a relaxed, massless vertical spring with a force constant of 294 N/m. The object is dropped onto the spring. How far does the object compress the spring?
A 6.7 g bullet is fired into a 1.3 kg ballistic pendulum. The bullet emerges from the block with a speed of 137 m/s, and the block rises to a maximum height of 10 cm. Find the initial speed of the b
The driver has a mass of 88 , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
An old oaken buck of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise t
The cable of a 2048-kg elevator has broken, and the elevator is moving downward at a steady speed of 1.59 m/s. A safety braking system that works on friction prevents the downward speed from increa
What is the absolute value of the magnetic field inside the inner coil? What is the absolute value of the magnetic field between the coils?
The acceleration due to gravity at the surface of the moon is 1.62 m/s^2. What is the average velocity of the rock during the first 22.0 s of flight
If two small beakers of water, one at 70 and one at 80, are emptied into a large beaker, what is the final temperature of the water?
The coefficient of kinetic friction between the box and the ramp is 0.23. Find the horizontal force to move the box up with a constant acceleration of 4.10ms^-2.