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1.) Suppose you weigh 587 N, and when you stand on one foot, your weight is spread out over an area of 1.510×10-2 m2. What is the pressure does your foot exert on the floor?
2.) Atmospheric pressure is around 1.010×105 Pa. Think about the air pushing on a circular glass window which has a radius of 0.0810 m. What is the force with which the air is pushing on one side of the glass?
The car in the drawing is moving to the left at 35 m/s. The car's horn continuously emits a 2.20 × 102 Hz sound. What is the wavelength of the sound in the direction of motion of the car
A uniform electric field exists in the region between two oppositely charged plane parallel plates. Find the speed of the electron when it strikes the second plate
It is desired to cool iron parts from 500°F to 100°F by dropping them into water that is initially at 55°F. how many kilograms of water are needed per kilogram of iron
An electron is accelerated by a constant electric field of magnitude 285 N/C. a. Find the acceleration of the electron (N) b. If the string can withstand a maximum tension of 0.180 N, what is the smallest value d can have before the string breaks.
A particle moves along the x axis. It is initially at the position 0.330 m, moving with velocity 0.250 m/s and acceleration -0.280 m/s2. Find its velocity at the end of this time interval
For the third circuit, consisting of a single battery and two light bulbs in parallel, what is the total resistance of the circuit if each light bulb has a resistance of 7.7 ohms? What is the current through each bulb
A water hose 2.75 cm in diameter is used by a gardener to fill a 28.0-liter bucket. (One liter = 1,000 cm3.) Over what horizontal distance can the water be projected
A refrigerator requires 10 J of work and exhausts 70 J of heat per cycle. What is the refrigerator's coefficient of performance
If Galileo dropped a 2.37 kg cannon ball from the 58.5m Tower of Pisa, how much work did gravity do on the ball
An alarm clock is set to sound in 20 h. At t = 0, the clock is placed in a spaceship moving with a speed of 0.72c (relative to Earth). What distance, as determined by an Earth observer, does the spaceship travel before the alarm clock sounds?
A boy shoves his stuffed toy zebra down a frictionless chute, starting at a height of 1.67 m above the bottom of the chute and with an initial speed of 1.97 m/s. The toy animal emerges horizontally from the bottom of the chute and continues sliding a..
An ideal fluid flows at 12 m/s in a horizontal pipe. If the pipe narrows to half its original radius, what is the flow speed in the narrower section
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