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A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 4.50t2 - 3.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 4.00 s?
A swimmer heads directly across a river, swimming at 1.60 m/s relative to the water. She arrives at a point 58.0 m downstream from the point directly across river, 63 m wide. What is the speed of the river current.
A charge of -3.0 nC is at the origin and a second charge of 15.0 nC is at x = 7.00 m. Find the magnitude and direction of the electric field
A physics professor demonstrates the Doppler effect by tying a 650 Hz sound generator to a 1.1 m long rope and whirling it around her head in a horizontal circle at 100 rpm.
After emptying her lungs, a person inhales 4.24 L of air at 0 °C and holds her breath. How much does the volume of the air increase as it warms to her body temperature of 37.1 °C
A 0.498 kg air cart is attached to a spring and allowed to oscillate. Calculate the maximum kinetic energy of the cart
A pyramid with horizontal square base, 4.40 m on each side, and height of 4.00 m isplaced in a vertical electric field of 46.0 N/C. Calculate the total electric flux through the pyramid's four slanted surfaces.
Calculate the percent reflection loss when a beam of radiation passes from air through a plate back into air assuming that the plate has a refractive index of 1.45
A doubly charged helium atom whose mass is 6.6 10 to 27 kg is accelerated by a voltage of 2200 V. What will be its radius of curvature if it moves in the plane perpendicular to a uniform 0.308 T field?
What lengths of ship three sides according to the observer
In open heart surgery a much smaller amount of energy will defibrillate the heart. Find the amount of stored charge
A dc motor is connected to a constant emf of 15.6 V. The resistance of its windings is 2.0 ohms. What is the back emf induced in the windings at normal speed
Two ships are moving along a line due east. The trailing vessel has a speed of 16 km/h relative to a land-based observation point, What frequency is monitored by the leading ship
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