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At a stunt show, an 80 kg motorcyclist goes around a vertical loop, which has a radius of 20 m. When the motorcyclist is at the top of the loop, as shown, he has a speed of 20 m/s. At this instant, what is the normal force on the cyclist?
A slender, 470- g bar magnet 20.0 cm long has a magnetic moment of 5.60 A m2. It is held at an angle of 45o to the direction of a uniform magnetic field.
The heels on a pair of women's shoes have radii of 0.42cm at the bottom. If 32 percent of the weight of a woman weighing 580N is supported by each heel, find the stress on each heel.
A horizontal force of magnitude 36.4N pushes a block of mass 3.81 kg across a floor where thecoefficient of kinetic friction is 0.640. find the increase in the kinetic energy of the block
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27 °C. A 500-g sample of silver at an initial temperature of 87 °C is placed in the water. Calculate the mass of the aluminum cup
Two identical piano wires have a fundamental frequency of 491 Hz when kept under the same tension. when both wires oscillate simultaneously
A current of 8.71 A in a long straight wire produces a magnetic field of 4.99 µT at a certain distance from the wire. Find the distance
What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road.
An alpha particle(q = +3.20×10−19 C) moves at avelocity of 2.45×104 m/s inthe positive x direction through a magnetic field of 0.0765 T that points in the negative zdirection. What are (a) the magnitude and (b) the direction of the magnetic force on ..
Dave needs to get groceries from the store, which is a distance of D=2.8km east of his house, What is the direction of Dave's displacement for the entire trip
A 2.71 kilogram bucket is attached to a disk-shaped pulley of radius 0.115 meter and mass 0.787 kilogram. Find how far does the bucket drop in 1.05 sec
The bottom of an aluminum pot has an area of 187 cm2 and a thickness of 5.25 mm. How many watts are needed to boil water at this rate
A 1500-W heater is designed to be plugged into a 120-V outlet. What current will flow through the heating coil
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