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It takes the elevator in a skyscraper 4.1s to reach its cruising speed of 13m/s. A 68kg passenger gets aboard on the ground floor.
A) What is the passenger's weight before the elevator starts moving? (to two sig figs using the appropriate units)
B) What is the passenger's weight while the elevator is speeding up? (to two sig figs using the appropriate units)
C) What is the passenger's weight after the elevator reaches its cruising speed? (to two sig figs using the appropriate units)
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. What is the net charge of all these electrons
A van is approaching a stationary motion detector at 45 m/s. The motion detector emits ultrasonic sound waves toward the van, what is the frequency of the reflected sound measured by the detector
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.60×106N, What is the total work done by the two tugboats on the supertanker
A 3-ft-diameter semicircular channel made of unfinished concrete is to transport water to a distance of 1-m uniformly. determine the minimum elevation difference across the channel
A river has a steady speed of 0.482 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point. If the student can swim at a speed of 1.24 m/s in still water, how long does the trip take
A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. What is the altitude of the projectile at this instant
A person who weighs 684 N steps onto a spring scale in bathroom, and the spring compresses by 0.518 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses spring by 0.328 cm.
Monochromatic light falls on two very narrow slits 0.053 mm apart. Find the wavelength and frequency of the light
A 0.39 V potential di?erence is maintained across a 1.7 m length of tungsten wire that has a cross-sectional area of 0.85 mm2, What is the current in the wire
Fifty grams (50g) of hot water at 90 degrees C are mixed with 70g of cold water at 20 degrees C. What is the final temperature of the mixture when it reaches equilibrium
Two small charges with a mass of 1.0 g each are connected by 2.0-cm-long insulating rod of negligible mass. Obtain the moment of inertia around the center of mass
A closely wound circular coil with a diameter of 4.80 cm has 625 turns and carries a current of 0.540 A. What is the magnetic field at the center of the coil
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