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Why is skiing into a wall of deep powder less hazardous to your health than skiing into a wall of bricks? Assume in both cases that you have the same initial speed and come to a complete stop.
The increased stopping time in powder means a smaller stopping force
The decreased stopping time In powder means larger stopping force
The change in momentum is less in powder
The impulse is less in powder
A roller coaster descends 35 meters in its initial drop and then rises 23 meters before going over the first hill. If a passenger at the top of the hill feels an apparent weight which is one-half of her normal weight, what is the radius of curvature ..
A 500kg car traveling due east at 54.0km/h collides head on with a 3000kg van moving at 18.0km/h. calculate the velocity of the combined mass
An uncharged 4.70*10^-6 F capacitor and an 8.00 *10^5 Omega resistor are placed in series with a 12.0 V battery. find the Maximum Current through the curcuit after the switch is closed
Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Use conservation of energy to determine the difference in the speed of the two balls when they hit the ground
A car is parked on a steep incline, making an angle of 37.0° below the horizontal and overlooking the ocean, when its brakes fail and it begins to roll. Find the time interval elapsed when it arrives there
Radioactive isotopes are often introduced into the body through the bloodstream. If the decay rate in the thyroid 24.0 d later is actually measured to be 17.0Bq , what percent of the tracer went to that gland
The heels on a pair of woman's shoes have radii of 0.46 centimeter at the bottom. If 30% of the weight of a woman weighing 560 N is supported by each heel, calculate the stress on each heel
A bowling ball is released from rest and rolls without slipping down an inclined plane at 18° to the horizontal. What is the speed (m/s) of its center of mass after it has rolled 2.5m down plane? Think about the bowling ball to be a uniform sphere.
q1. two wires each 28.15 cm long are connected to two separate 9.00 v batteries as shown in the figure. the resistance
With what tension must a rope with length 2.80m and mass 0.170 kg be stretched for transverse waves of frequency 41.0Hz to have a wavelength of 0.910m
A sinusoidal electromagnetic wave emitted by a cellular phone has a wavelength of 34.0cm and an electric-field amplitude of 4.30×10?2v/m at a distance of 200m from the antenna. Calculate the magnetic-field amplitude
An electromagnetic flowmeter is used to meausre blood flow rates during surgery. Which of the two leads is at the higher potential
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