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Question1
Using a simply pulley or rope system, a crewman on an Arctic expedition is trying to lower a 6.30 kg crate to the bottom of a steep ravine of height 23.4 meters. The 45.0 kg crewman is being careful to lower the crate at a constant speed of 1.50 m/s. unfortunately, while the crate reaches a point 13.0 meters above ground, the crewman slips and the crate immediately accelerates toward the ground, dragging hapless crewman across the ice and toward the edge of the cliff. If we suppose ice is perfectly slick (that is, no friction between the crewman and the ice once he slips and falls down), at what speed will the crate hit ground? Suppose also that the rope is long sufficient to allow the crate to hit the ground before the crewman slides over the side of the cliff.
Question2
A large uninsulated home may want 1.1 million Btu of heat energy from furnace on a cold winter day. What is price in dollars to heat this house for that day with natural gas, assuming 60 percent furnace efficiency (do not enter a dollar sign. such as if the price is 17 dollars and 25 cents, enter 17.25) (Think a little about your answer - what's a winter heating bill look like for owners?)
A 1.00 Kg ball is shot out of a cannon inclined at 40 degrees, by a spring initially compressed by 0.500 m. Where does the ball land relative to the cannon
A uniform metal rod, with a mass of 3 {rm kg} and a length of 1.2 {rm m}, is attached to a wall by the hinge at its base. A horizontal wire bolted to the wall 0.51 m above the base of the rod holds the rod at an angle of 25{rm ^circ} above the hor..
An object moves up and down y-axis with an acceleration given as a function of time t by the expression a = A sin ω t, where A and ω are constants. What is the period of this motion.
A hardworking ant must supply 0.00655 N to pull a small piece of fruit at constant velocity over a distance of 8.00 cm up a small hill to the entrance of the colony. Use the work-energy theorem to calculate the mass of the piece of fruit in grams
24.0g of copper pellets are removed from a 300 ? C oven and immediately dropped into 120mL of water at 24.0 ? C in an insulated cup. What will the new water temperature be
A rock is tossed straight up with a speed of 29 m/s. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole
The water level in a vertical glass tube 1.300 m long can be adjusted to any position in the tube. What is the greatest depth of water for which there will be resonance in the air in the tube
A pilot claims to have seen a UFO moving initially at the speed of about 440 m/s in an easterly direction and then, in a tie interval of only 1.0s turning 45 degrees and moving souutheast at 440 m/s
A golf ball strikes a hard, smooth floor at an angle of 33.1 ° and, as the drawing shows, rebounds at the same angle. find the magnitude of the impulse applied to the golf ball by the floor
The intersection is 15 m wide. Her car's maximum deceleration is -6.8m/s2, whereas it can accelerate from 43km/h to 70km/h in 8.1 s. Overlook length of her car and her reaction time.
A rock is dropped off the side of a bridge and hits the water below 5.7 s later. What was the rock's velocity when it hit the water
A gauge-12 wire has diameter centimeters and length meters. while the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per cubic meter.
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