Get college assignment help at uniessay writers now you are driving at constant speed with the coffee cup still on the roof of your car, when you approach a curve in the road whose radius of curvature is 35m. with what maximum speed can you round the curve, such that the coffee cup does not slide?
marble rolls off the edge of a table that is 1.21 meters high and lands 0.31 meters from the base of the table. (a) How long does it take for the marble to fall to the floor?
A 68-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.11. What would be the magnitude of the acceleration?
When a rubber band is stetched a distance x, it exerts a restoring force F = -2x 5x^5. What is the work done in stretching this rubber band from x=0 to x=2?
A uniform plank of length 4.3m and weight 236N rest horizontally on two supports, with 1.1m of the plank hanging over the right support. To what distance x can person who weighs 450N walk on the overhanging part of the plank before it just begins to tip?
A car of mass M = 1300 kg traveling at 60.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car’s tires. What is the radius r of the turn if theta = 20.0 degrees (assuming the car continues in uniform circular motion around the turn)?
30.0 mu F capacitor initially charged to 30.0 mu C is discharged through a 1.20 kOmega resistor. How long does it take to reduce the capacitor’s charge to 1.00 mu C?
street lamp weighs 190 N. It is supported by two wires that form an angle of 130° with each other. The tensions in the wires are equal. (a) What is the tension in each wire supporting the street lamp?
A 1.40 kg bottle of vintage wine is lying horizontally in the rack shown in the drawing. The two surfaces on which the bottle rests are 90.0° apart, and the right surface makes an angle of 45° with respect to the ground. Each surface exerts a force on the bottle that is perpendicular to the surface. What is the magnitude of each of these forces?
An arrow is fired horizontally with a speed of 68. m/s directly at the bulls eye of a target 50 m away. When fired, the arrow is 120 m above the ground. How far short of the target does it strike the ground?
Get college assignment help at uniessay writers A batter hits a 0.140-kg baseball that was approaching him at 30.0 m/s and, as a result, the ball leaves the bat at 40.0 m/s in the direction of the pitcher. The ball remains in contact with the bat for 2.0 ms. What is the average force exerted by the bat?
a 600kg car is going around a banked curve with a radius of 110m at a speed of 24.5m/s. what is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A 72-kg lumberjack stands at one end of a 379-kg floating log, as shown in the figure. Both the log and the lumberjack are at rest initially.
The rotational inertia of a collapsing spinning star changes to 1/4 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy?
You hold a meterstick horizontally with the same mass suspended at the end. Rank the torque needed to keep the stick steady; from largest to smallest. A. Meterstick is held at a 45 degree angle, upward, with weight suspended at the end. B. Meterstick is held horizontally(left to right and in a straight line), with weight suspended at the end. C. Meter Stick is held downward, at a 45 degree angle, with weight suspended at the end.
an alpha particle with kinetic energy 11.0 MeV makes a head on collision with a lead nucleus at rest. what is the distance of closest approach of teh two particles? assume that the lead nucleus remains stationary and that it may be treated as a point charge
A 800 g ball moves in a vertical circle on a 1.07 m-long string. If the speed at the top is 5.00 m/s, then the speed at the bottom will be 8.18 m/s. (a) What is the tension in the string when the ball is at the top? (b)What is the tension in the string when the ball is at the bottom?
A 66kg distance runner increase her speed from 4.0m/s to 7.0m/s.how much work did the runner do in increasing her speed?
A 67.0 kg person throws a 0.0450 kg snowball forward with a ground speed of 30.0 m/s. A second person, with a mass of 55.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.00 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice.
A coil of wire (lying horizontally on a table) has a current running through it in a clockwise direction as shown. (The arrows in the diagram are on the side of the coil toward you.) The north pole of the resulting electromagnet is . . . Above the coil. Below the coil. In front of the coil (the side toward you). In back of the coil (the side away from you). Question 2 1 points Save A current carrying wire is placed directly above a compass. What happens to the compass needle when the current is turned on? The needle points in the direction of the current. The needle points opposite the direction of the current. The needle points perpendicular to the current. The needle doesn’t move. Question 3 1 points Save A glass rod is given a positive electric charge by rubbing it with a silk cloth. The rod is then held still near a compass. Assume there is neither electrical charging of the compass needle by induction or electrostatic polarization. What happens to the compass needle? The needle rotates so that it points toward the rod. The needle rotates so that it points away from the rod. The needle rotates so that it is parallel to the rod. The needle doesn’t rotate at all. Question 4 1 points Save Magnetic force like electrostatic force and gravitational force increases with distance. True False Question 5 1 points Save A magnet is brought closer to a loop of wire. What happens to the flux through the loop? It decreases. It stays the same. It probably increases in size, but it depends on the orientation of the loop and magnet. Question 6 1 points Save A magnet is dropped through a loop of wire. As the magnet falls and approaches the loop, what direction is the force on the magnet from the loop It is attractive. It is repulsive. There is no force. Question 7 1 points Save An electron is moving south. It enters a region where there is a magnetic field directed East. The electron will be . . . Deflected up. Deflected down. Deflected East. Deflected west. Not deflected at all. Question 8 1 points Save A conducting rod is placed, as shown, so that it can slide towards or away from you on a horizontal closed conducting track (rails). The track is located in a uniform magnetic field directed upward (toward the top of the paper). As the rod is pulled toward you the current in the rod is . . . (Hint: The size of the conducting loop is getting larger. Think of Lenz’s law.) To the left (clockwise around the loop if you look down on it from the top). To the right (counterclockwise around the loop if you look down on it from the top). Zero. Question 9 1 points Save Suppose you are looking down at the top of a circular loop of wire whose plane is horizontal and that carries a current in the counterclockwise direction. What is the direction of the magnetic field at the center of the circle? Perpendicular to the plane of the loop and downward. Perpendicular to the plane of the loop and upward. Parallel to the plane of the loop and to the left. Parallel to the plane of the loop and to the right. Question 10 1 points Save Two current carrying wires are placed so that they are parallel to each other with the current running in the same direction. The force that they exert on each other . . . Is repulsive. Is attractive. Will try to make them rotate so they are perpendicular. Is zero.
A 340 kg piano slides 3.5 m down a 32^circ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure ). The effective coefficient of kinetic friction is 0.31. a)Calculate the force exerted by the man. b)Calculate the work done by the man on the piano. c)Calculate the work done by the friction force. d)Calculate the work done by the force of gravity. e)Calculate the net work done on the piano.
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