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A laser pointer has a beam intensity of 36 W/m2 and a beam radius of 2.4 mm. A first grader attempts to use it to move a black toy car. Assuming perfect absorption, what is the force on the car?
A jet pilot takes his aircraft in a vertical loop, as seen in figure below. If the jet is moving at a speed of 1450 km/hr at the lowest point of the loop, Determine the minimum radius of the circle
The electric field midway between two equal but opposite point charges is 755 N/C, and the distance between the charges is 15.8 cm. What is the magnitude of the charge on each
The thrust produced by a single jet engine, m=7300kg, creates a force F=73000N. It takes the jet a distance of d=0.84km to take off. What is the take-off speed of the jet
A string 120 cm long with a linear mass density 10^-2 kg/m is stretched to a tension of 36 N. The string is attached between two walls and when plucked forms a standing wave with 3 antinodes. Find the frequency of vibration. A standing wave pattern c..
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 3.45 × 10-11 m. Determine the magnitude..
You have a wire of length L = 1.9 m for making a square coil of a dc motor. The current in the coil is I = 1.6 A, Find the maximum torque exerted on the coil
A small piece of dust of mass m = 1.6 g travels horizontally through an electric air cleaner in which the electric field is 511 N/C. What is the charge on the dust particle
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
A 45.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 25.0° below the horizontal. Find the car's position relative to the base of the cliff when the car lands in the ocean
Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 30.0â. what is his speed as he leaves the roof
A plane touches down for a landing with a ground speed of 120 mi/h (53.7 m/s). The runway is 1000 m in length and the plane stops at the end of the runway after slowing down with constant acceleration. What is the plane's acceleration while stoppi..
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