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During a stress test of the cardiovascular system, a patient walks and runs on a treadmill.
(a) Is the energy expended by the patient equivalent to the energy of walking and running on the ground? Explain.
(b) What effect, if any, does tilting the treadmill upward have? Discuss.
Objects A and B are both positively charged. Both have a mass of 138 g, but A has twice the charge of B. How large is the electric force (in N) on A
A wire of mass 0.030 kg is stretched between fixed supports a distance 1.10 m apart. If the tension in the wire is 790 N, what is the speed of a wave along the wire in m/s
a hollow cube with 12 cm in each side and thickness 1 cm floats half submerged in a liquid of density kg/m^3. find the density of the cube
You are driving home from school steadily at 98km/h for 130km . It then begins to rain and you slow to 65km/h. You arrive home after driving 3 hours and 30 minutes. What was your average speed? How far is your hometown from school?
a the potential difference between the plates of a 2.90-microf capacitor is 80 v. how much energy is stored in the
A racing car of mass 1000kg moves around a banked track at a constant speed of 30ms. Assuming the total reaction at the wheels is normal to the track and the horizontal radius is 100m. Calculate the angle of inclination of the track to the horizon..
suppose you pour water into a container until it reaches a depth of 30.2 cm. next you carefully pour in a 14.8 cm
Big yellow fish swimming at 2.0m/s swallows little green fish at rest. Big yellow fish is 3 times as massive as little green fish. What fraction of big yellow fish's initial kinetic energy was lost in this collision
the membrane that surrounds a certain type of living cell has a surface area of 4.00 x 10-9 m2 and a thickness of 1 x
Three main component equations in the bohr model of the hydrogen atom. One of these is now said to represent the electron exhibiting a wave nature. Which one of the equations is this and why can it now be thought of as representing the wave behaviour..
A 48 kg skier skis directly down a frictionless slope angled at 13° to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier.
Two automobiles are equipped with the same single-frequency horn.When one is at rest and the other is moving toward an observer at15.6 m/s, a beat frequency of 5.52 Hz is heard. What is thefrequency the horns emit? Assume T = 20°C .
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