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At position C, the child is again momentarily at rest at the top of the jump. Assume that the combined mass of child and pogo stick is 27.0 kg.(a) Calculate the total energy of the system if both po
When a 2.90-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.76 cm. (a) What is the force constant of the spring?
How many ways can we use to connect 4 resistors in a circuit that has a certain value of circuit current, which is somewhere between least and the max. current meaning (Series-Parallel Circuit).
A cosmic ray proton in interstellar space has a kinetic energy of 10.0 MeV and maintains a circular orbit having a radius equal to that of Mercury's orbit around the sun, which is 5.80 x 10^10 m. Wh
How would you express this wavelenght in microns? Where is the wavelenght with respect to the center of the wavelenght distribution of the sun's radiation?
A solenoid surrounds the TPC and creates a uniform magnetic field in the z direction. The field points from right to left and has a magnitude of 0.5 T. It terminates outside the outer field cage and
When Lois is at a height h = 5.00 m from the ground (point B), Superman comes to the rescue and provides an upward force F so that she reaches the ground (point C) with zero speed. a. Use the work-k
A baseball player hits a homerun , and the ball lands in the left field seat, 7.5m above the point at which it was hit. The ball lands with a velocity of 36m/s at an angle of 28 degrees below the ho
A singly ionized oxygen atom moves at 9100 m/s in a circular path perpendicular to a 0.60 T magnetic field. Find the radius and period of its circular motion.
A motorcycle has a constant speed of 20.0 m/s as it passes over the top of a hill whose radius of curvature is 148 m. The mass of the motorcycle and driver is 340 kg. (a) Find the magnitude of the c
You are actually measuring the magnetic field produced by all four sides of the loop of wire.
The temperature of the Sun's surface is 5800 K. Calculate the relative number of hydrogen atoms in each of the first three electronic states at this temperature. Don't forget the degeneracies of the
If angular momentum is conserved for a propeller driven plane, it seems that if the propeller is turning clockwise, the airplane should be turning counter clockwise. Why doesn't this occur?
A 45.0 hollow copper cylinder is 90.0 long and has an inner diameter of 1.0 cm. The current density along the length of the cylinder is 1.50×105 . What is the current in the cylinder?
A 5.00-kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 3.20 mm deep, what is the average force exerted by the plate on the ball during the impact?
An object is 17 cm in front of a diverging lens that has a focal length of -11 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.
A block of wood (M block = 5.2 kg) rests on a horizonal surface for which the coefficient of kinetic friction is 0.28. A bullet (m bullet = 32 g) is shot along the horizontal direction and embeds in
An electron (mass m = 9.11 multiplied by 10-31 kg) is accelerated in the uniform field E (E = 1.90 multiplied by 104 N/C) between two parallel charged plates. The separation of the plates is 1.30 c
In an experiment for measuring the speed of sound, a gun was shot 715m away from the observer. It was heard 2.13seconds after the flash was seen. What was the speed of the sound in the air at the ti
What is the expression for the work done by non-conservative forces on the rock? (Use any variable stated above along with the following as necessary: g)
Two ice skaters are skating hand in hand along a frozen, horizonal surface. The center of mass of both skaters runs immediately between them. The two skaters have respective masses of 60 kg.and 100
What was the horizontal component of the velocity of the jumping skateboarder just before he landed on the skateboard?
The cars lock bumpers and then slide away together after the collision. What are the magnitude and direction of their final velocity?
Consider a tennis player who hits a serve at 140 mi/h (63 m/s). Estimate the average force exerted by the racket on the ball (m=57g)?
Find the minimum speed at which a car can travel around this curve without skidding if the coefficient of static friction between the road and the tires is 0.7. Answer in units of m/s.