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The critical density of the universe is 5.80×10^?27 kg/m^3A) Assuming that the universe is all hydrogen, express the critical density in the number of H atoms per cubic meter.B) If the density of the universe is equal to the critical density, how many atoms, on the average, would you expect to find in a room of dimensions 4.80m*9.00m*3.60 ?C) Find the number of atoms in the room in part (B) under normal conditions on the earth.
A particle of charge = +5.5 µC is released from rest at the point x = 55 cm on an x axis. What is the kinetic energy of the particle at the instant it has moved 40 cm if Q = +15 µC
The projection lens in a certain slide projector is a single thin lens. A slide 24.6 mm high is to be projected so that its image fills a screen 1.78 m high. Determine the focal length of the projection lens
A 0.51 kg mass at the end of a spring vibrates 9.0 times per second with an amplitude of 0.18 m. Determine the total energy of the system
Suppose a block with mass 2.30kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.420. Find the maximum static friction force that acts on the block.
Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.250 and that the coefficient of kinetic friction between block 2 and the plane is = 0.400. Find out the mass of block 2, , when = 30.0.
Three capacitors C1 = 2.5 µF, C2 = 7.5 µF, and C3 = 13 µF are connected as shown with a battery of voltage V = 18 V. (When entering units, use micro for the metric system prefix µ.) (a) What is the equivalent capacitance of this circuit? (b) What is ..
The exterior walls of a house have a total area of 204 m2 and are at 11.4°C and the surrounding air is at 7.4° C. Find the rate of convective cooling of the walls
A uniformly charged sphere has a potential of 490 V on it's surface. At a radial distance of .24m from this surface the potential is 120 V. What is the radius of the sphere
A pickup truck has a width of 78.3 in. what magnitude emf is induced between the driver and passenger sides of the truck
A coil is located at the center of a long solenoid of R= 15 cm whichhas 5x10^7 turns per meter and carries a current I=16 A. The coil is coaxial with the solenoid and consist of 5 turns of wire, each in shape of length a=5cm on each side. What is ..
Playing horseshoes the object is to throw a 1kg horse shoe a horizontal distance of 10.5 m to a vertical stake. at what angle does the shoe impact the ground
A 73kg human sprinter can accelerate from rest to 12m/s in 3.2s . During the same interval, a 31kggreyhound can accelerate from rest to 19m/s. Compute the average power output for each
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