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Assume a typical hummingbird has a lifespan of 4.0 years and an average heart rate of 1300 beats per minute. (a) Calculate the number of times a hummingbird's heart beats in its life, and express it in scientific notation. Use 365.24 days per year. (b) A long-lived elephant lives for 61 years, and has an average heart rate of 25 beats per minute. Calculate the number of heartbeats in that elephant's lifetime in scientific notation.
A 63 kg girl weighs herself by standing on a scale in an elevator. What is the force exerted by the scale while the elevator is descending at a constant speed of 10.0 m/s.
A 11.0 kg monkey starts to climb a long rope to reach a banana located at a height of 6.50 m, Calculate the least amount of time the monkey could take to reach the banana without breaking the rope
Oxygen diffuses from the surface of insects to the interior through tiny tubes called tracheae. An average trachea is about 2 mm long, Find the concentration of oxygen in the air
A wave crest passes an observation point followed by a second crest. how long are the wavelengths
an object is at a distance d to the left of a flath screen. A converging lens with focal length f
A 20.0- projectile is fired at an angle of 60.0 above horizontal with a speed of 80. At the highest point of its trajectory, projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed. You can ign..
A number of people are riding in a hot-air balloon. The combined mass of the people and balloon is 281 kg. The balloon is motionless in the air, since the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' f..
The same voltage is applied between the plates of two different capacitors. When used with capacitor A, this voltage causes the capacitor to store 12 C of charge and 6.1 x10-5 J of energy.
Disscus how the conservation of energy law explain whys the temperature of a gas increases when it is quickly compressed, whereas the temperature decreases when the gas expands.
A rock is tossed straight up with a speed of 29{\rm m}/{\rm s}. What is the rock's velocity as it hits the bottom of the hole
A thin layer of oil (n=1.50) floats on water. Destructive interference is observed for reflected light of wavelengths 480 nm and 600 nm, Find the two minimum thickness of the oil film
A certain atom of has 81 protons. Assume that the nucleus is a sphere with radius 6.99 fm, compute the magnitude of the electric field produced by the protons
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