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A bluetooth headset has an intensity of 0.08 W/m2 at 5 cm distance. If you carry your phone on your belt, 75 cm from the center of your brain, what is the total intensity (headset plus phone) at the center of your brain? (At a distance of 5 cm, the microwave radiation from a cellphone has an intensity of 32 W/m2)
Makeshift child's swing: Child's weight, magnitude of force, maximum angle, A makeshift swing is constructed by making a loop in one end of a rope and tying the other end to a tree limb.
Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and kno..
4 lbm of water is in a volume of 10.0 ft3 at 60 psi. The water undergoes an isobaric change of state until the temperature is 500°F. Find the temperature at the initial state
You are driving north on 107th Avenue at a speed of 32.6 mph. At what frequency do you year the siren
A nuclear power plant operates at 75% of its maximum (Carnot) efficiency between temperatures of 625 degree C, how much exhaust heat is discharged per hour
Two cars of the same mass collide at an intersection. Just before the collision one car is traveling east at 40.0 km/h and the other car is traveling south at 70.0 km/h. what is the speed of the cars immediately after the collision
By how much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest? How much horizontal force would you need to keep it moving?
A solid spherical conductor of radius 15 cm has a charge Q = 6.5 nC on it. How much charge is there on the second sphere after the two spheres have been separated
How many moles of air are left in the tire?
A point charge with q1 = +2.8 C is located at x = 3.0 m, y = 0, and a second point charge with q2 = +4.4 C is at x = +1.0 m, y = +3.0 m. What are the components of the electric field at x = +1.0 m, y = 0
The force of the wind on the sails of a sailboat is 300 N north. The water exerts a force of 210 N east. If the boat (including crew) has a mass of 310 kg, illustrate what are the magnitude and direction of its acceleration?
A singly ionized Nickel atom has an overall charge of 1.602 x 10^-19C and a mass m = 9.80 x 10^-26 g. what will the radius of the curved path that the Nickel atom has within the deflection chamber be
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