Get college assignment help at uniessay writers a friend has journeyed to the mountain foothills to escape the effects of radioactivity altogether. while bathing in the warmth of a natural hot spring she wonders aloud how the spring gets heat. what do you tell her?
A 59 kg skier encounters a dip in the snow’s surface that has a circular cross section with a radius of curvature of 12 m. If the skier’s speed at point A as shown below is 7.0 m/s, what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces.
a 28 gram rifle bullet traveling 230 m/s buries itself in a 3.6 kg pendulum hanging on a 2.8 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulums displacement
Water at a pressure of 3.4 atm at street level flows into an office building at a speed of 0.5 m/s through a pipe 7 cm in diameter. The pipes taper down to 2.6 cm in diameter by the top floor, 28 m above. Calculate the water pressure in such a pipe on the top floor.(g = 9.8 m/s2)
A particular Ferris wheel has a radius of 25 meters, and it makes one complete revolution around its axle (at location A) in 20 seconds. In all of the following questions, consider location A (at the center of the axle) as the location around which we will calculate the angular momentum. At the instant shown in the diagram, a child of mass 30 kg, sitting at location F, is traveling with velocity m/s.
A gymnast of mass 59.0 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value for the acceleration of gravity.
Figure 8-30, a 2.00 g ice flake is released from the edge of a hemispherical bowl whose radius r is 22.0 cm. The flake–bowl contact is frictionless. (a) How much work is done on the flake by the gravitational force during the flake’s descent to the bottom of the bowl? (b) What is the change in the potential energy of the flake–Earth system during that descent? (c) If that potential energy is taken to be zero at the bottom of the bowl, what is its value when the flake is released? (d) If, instead, the potential energy is taken to be zero at the release point, what is its value when the flake reaches the bottom of the bowl? (e) If the mass of the flake were doubled, would the magnitudes of the answers to (a) through (d) increase, decrease, or remain the same?
In 9.3 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation). The line is being reeled in at a constant speed. Determine the angular speed of the reel.
If a person can jump a horizontal distance of 3 m on Earth, how far could the person jump on the moon, where the free-fall acceleration is g/6?
a boy standing on a 19.6 meter tall bridge sees a motorboat approaching the bridge at a constant speed. When the boat is 27 meters from the bridge, the boy drops a stone to the water below. If the stone strikes the water at 3.0 meters in front of the bow of the boat, at what speed is the boat traveling?
Get college assignment help at uniessay writers A 3.5 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 17.4 N. Find the speed of the block after it has moved 5 m. Answer in units of m/s.
Strictly speaking, as more and more skyscrapers are being built on the surface of earth, does the day tend to become longer or shorter?
A kg steel ball strikes a wall with a speed of m/s at an angle of with the surface. It bounces off with the same speed and angle (Fig. P6.14). If the ball is in contact with the wall for s, what is the average force exerted on the ball by the wall?
A raft is made of 13 logs lashed together. Each is 37 cm in diameter and has a length of 5.6 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 70 kg? Do not neglect the weight of the logs. Assume the density of wood is 600kg/m
A high-speed flywheel in a motor is spinning at 450 when a power failure suddenly occurs. The flywheel has mass 39.0 and diameter 73.0 . The power is off for 25.0 and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 170 complete revolutions.
A female gymnast weighs 700 N. If she is hanging stationary from a high bar, how many forces are acting on her?
Energy Change During a Hip Check. Ice-hockey star Wayne Gretzky is skating at 13.0 m/s toward a defender, who in turn is skating at 5.0 m/s toward Gretzky . Gretzky’s weight is 756 N; that of the defender is 900 N. Immediately after the collision, Gretzky is moving at 1.5 m/s in his original direction. You can ignore external horizontal forces applied by the ice to the skaters during the collision. Calculate the change in the combined kinetic energy of the two players.
What torque must the motor supply to take the disk from 0 to 1600 rpm in 4.2 s?
A 3.9 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 18 N. Find the speed of the block after it has moved 4.9m. Answer in units of m/s.
A race car has a mass of 717 kg. It starts from rest and travels 35.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.20 m/s relative to the ground. A teammate passes the ball to him. The ball has a speed of 13.7 m/s and is moving in a direction of 32.2 degree east of north, relative to the ground. What is the magnitude of the ball’s velocity relative to Juan? What is the direction of the ball’s velocity relative to Juan?
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