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If this planet has the same density as Neptune (1.76 ), what is its radius expressed in kilometers? What is its radius expressed as a multiple of earth's radius?
The ball's mass is 0.48 kg. What is the magnitude of the net force acting on the soccer ball at this instant?
The coefficient of kinetic friction for a 25 -kg bobsled on a track is 0.10. A) What force is required to push it down a 6.0^circ incline and achieve a speed of 70 km/h at the end of 75 {rm m}?
A 67.0 kg person throws a .0400 kg snowball forward with the ground speed of 30.0 m/s. A second person with the mass of 55 kg catches the snowball. Both people are on skates. The first person is ini
A driver is traveling eastward on a dirt road when she spots a pothole ahead. She slows her car from 14.0 m/s to 5.5 m/s in 6.0 s. What is the car's acceleration?
A jetliner, traveling northward, is landing with a speed of 72 m/s. Once the jet touches down, it has 795 m of runway in which to reduce its speed to 6.3 m/s. Compute the average acceleration (magni
An electron is accelerated through 2300 V from rest and then enters a region where there is a uniform 1.20 T magnetic field. What are the maximum and minimum magnitudes of the magnetic force acting
You can ignore air resistance. Where on the ground (relative to the position of the helicopter when she drops) should the stuntwoman have placed the foam mats that break her fall?
A 22 kg child sits in a swing supported by two 1.7 m long chains. If the tension in each chain at the lowest point is 172 N, find the child's speed at the lowest point .
If the rock rolls to the bottom of the hill, what is its kinetic energy at the bottom of the hill?
A 2.19 kg block initially at rest pulled to the right along a horizontal surface by a constant, horizontal force of 16.1 N. the coefficient of kinetic friction is 0.145. the acceleration of gravity
A train 382 m long is moving on a straight track with a speed of 86.3 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 10 km/h. Assumin
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to maximum height of 35 m above groud level. how much work is done on the mass by air r
A daredevil is shot out of a cannon at 25° to the horizontal with an initial speed of 35 m/s. A net is positioned a horizontal distance of 87 m from the cannon. At what height should the net be
A physics student stands on a bathroom scale in an elevator which is not moving. The scale reads 620 N. The elevator then accelerates downward at 1.36 m/s2. What does the scale read during this acc
A magnetic computer disk 9.44 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates 520.0 rad/s2 for 0.500s, then coasts at a steady angular veloc
To hoist himself into a tree, a 67.5-kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. He then pulls downward on the free end of the rope with
The driver of a 1800 {rm kg} car traveling on a horizontal road at 100 {rm km}/{rm h} suddenly applies the brakes. Due to a slippery pavement, the friction of the road on the tires of the car, which
A block with mass m = 20.4 kg slides down an inclined plane of slope angle 17.8 o with a constant velocity. It is then projected up the same plane with an initial speed 4.35 m/s. While the mass is h
Vector A has a magnitude of 8.00 units and makes an angle of 45.0 degrees with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graph
We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid it will be traveling with speed 243 m/s. We have a large and powerful spring whose
A 45.0 kg girl is standing on a 161 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a co
A 45.0 g Super Ball traveling at 26.0 m/s bounces off a brick wall and rebounds at 19.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 5.00 ms, what is the
When it is at the bottom of the circle, the ball has a speed of 13.7m/s. Calculate the magnitude of the tension in the cable when the mass is at the bottom of the circle.
A bicycle and its rider together has a mass of 75 kg. What power output of the rider is required to maintain a constant speed of 3.6 m/s (about 8.1 mph) up a 5.0% grade (a road that rises 5.0 m for