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A solid concrete block weighs 130 N and is resting on the ground. Its dimensions are 0.440 m x 0.240 m x 0.0810 m. A number of identical blocks are stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground) that can be stacked so that their weight creates a pressure of at least two atmospheres on the ground beneath the first block? (Hint: First decide which face of the brick is in contact with the ground.)
An object is located 40 centimeter in front of a lens of focal length 40 centimeter. Estimate the lateral magnification of this system
The two plates of a capacitor hold +2130 µC and -2130 µC of charge, respectively, when the potential difference is 580 V. What is the capacitance
three point charges have equal magnitudes two being positive and one negative. these charges are fixed to the corners
A 600g model rocket is on a cart that is rolling to the right at a speed of 4.5m/s. At what horizontal distance left of the loop should you launch
a block, m= 3 kg, slides on a frictionless horizontal surface.It then goes up a 15 degree incline having a coeffecient offriction uk=0.30 a distance L before stopping. find the acceleration of the block on the plane
An aquarium tank is 100cm long, 35cm wide and 40cm deep. it is filled to the top. What is the force of the water on the bottom (100cm x35cm) of the tank? What is the force of the water on the front window (100cm x40cm) of the tank?
A small stereo amplifier produce a sound of 50 db at a distance of 20 ft from speaker. What must insensitive be to double the sound level to 100 db?
A 54.00 kg pole vaulter running at 10 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
An acoustic signal is composed of the first three harmonics of a wave of fundamental frequency 470 Hz. If these harmonics are described, in order, by cosine waves by amplitudes of 0.710, 0.170, and 0.790, what is the total amplitude of the signal at ..
What is the block's distance from equilibrium as the speed are 36 cm/s? What is block's position at t=1.0 s.
The wave function for a wave on a taut string is y(x,t) = 0.355 sin [(9)(pi)(t) - (3)(pi)(x) + (pi/4)], where x and y are in meters and t is in seconds. What is the energy contained in each cycle of the wave
A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m °C. what is the rate of heat flow through the comforter
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