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A 2.00 kg block hangs from a spring balance calibrated in Newtons that is attached to the ceiling of an elevator.
(a) What does the balance read when the elevator is ascending with a constant speed of 29 m/s?
(b) What does the balance read when the elevator is descending with a constant speed of 25 m/s?
(c) What does the balance read when the elevator is ascending at 39 m/s and gaining speed at a rate of 10 m/s2?(d) Suppose that from t = 0 to t = 4.9 s, the elevator ascends at a constant speed of 10 m/s. Its speed is then steadily reduced to zero during the next 3.2 s, so that it is at rest at t = 8.1 s. Describe the reading of the scale during the interval 0 < t < 8.1 s.
The intensity of the sound wave from a jet airplane as it is taking off is 105 W/m2 at a distance of 3.2 m. What is the intensity of the sound wave
A soccer ball of diameter 30 cm rolls without slipping at a linear speed of 2.7 m/s. Through how various revolutions has the soccer ball turned as it moves a linear distance of 16 m.
Four identical charges (+1.6 μC each) are brought from infinity and fixed to a straight line. Each charge is 0.32 m fromthe next. Determine the electric potential energy of this group.
A cylindrical piston sits on top of hydraulic fluid that exerts a force of 240 N on the piston. Find the magnitude of the net force on the piston
A long, narrow horizontal slit lies 1.00 µm above a plane mirror, which is in the horizontal plane. Find the distance from the mirror to the first maximum
A 50.0-kg student climbs a 5.00-m-long rope and atops at the top. How much work does she do
a 0.145-kg baseball pitched at 37.0 ms is hit on a horizontal line drive straight back toward the pitcher at 50.5 ms .
radioactive isotopes decay according to a first order process. if nt is the number of atoms of a radioactive isotope at
A block of mass m1 = 3.00 kg and a block of mass m2 = 8.00 kg are connected by a massless string over a pulley in the shape of a disk having radius R = 0.25 m, Determine the acceleration of the two blocks
A 171 kg block of ice at 0.0°C is placed in a large lake. The temperature of the lake is just slightly higher than 0.0°C, and the ice melts very slowly, What is the entropy change of the universe
a straight wire of length 2.09 m carries a current of 24.9 a. it is placed on a horizontal tabletop in a uniform
In a movie, Jason Borne evades his captors by hiding underwater for many minutes while breathing through a long, thin reed. calculate the deepest he could have been
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