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A Styrofoam slab has thickness h and densityρs. When a swimmer of mass m isresting on it, the slab floats in fresh water with its top at thesame level as the water surface. Find the area of the slab. (Userho_s for ρs, rho_w forρw, h for h, and m for mas necessary.)
The polarizability of large atoms can be estimated by using the formula for the polarizability of a metal sphere, \(\alpha = 4\pi\epsilon a^{3}\), Estimate the induced dipole moment of an oxygen atom
q1. a helicopter is ascending vertically with a speed of 5.57. at a height of 124 above the earth package is dropped
a worker exposure to noise in a given plant is measured as follows during various time periods in an 8-hour shifta.
The moon orbits the earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the earth andthe moon and that the mass of the earth is 5.98 x 1024kg. Find the period for the moon's motion around the earth.
Calculate the fast neutron flux needed to produce the same injury as 0.50 mSv/hr of thermal neutrons, and then, as 6,000 thermal neutrons per sq. cm per sec.
A NASA satellite has just observed an asteroid that is on a collision course with the Earth. With what speed will it hit the Earth's surface
What capacitance must be used in this circuit if the time constant is to be 3.4 ms.
A charge = 5.00 is placed at the origin of an xy-coordinate system, and a charge = -3.00is placed on the positive axis at 4.00, Find the direction of this force
A tightrope walker who weighs 640 N walks along a steel cable. When he is halfway across, the cable makes an angle of 0.040 rad below the horizontal. What is the cross-sectional area of the cable
The tub of a washer goes into its spin-dry cycle, startingfrom rest and reaching an angular speed of 4.0 rev/s in 7.0 s. Through how many revolutions does the tub turn
A billiard ball of mass m = 0.150 kg hits the cushion of a billiard table at an angle of ?1 = 60.0° at a speed of v1 = 3.00 m/s. It bounces off at an angle of ?2 = 63.0° and a speed of v2 = 2.10 m/s. a) What is the magnitude of the change in momentum..
At an outdoor market, a bunch of bananas attached to the bottom of a vertical spring of force constant 16.0 N/m is set into oscillatory motion with an amplitude of 20.0 cm. What is the weight of the bananas in newtons
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