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The weight of a block of metal is measured with a scale first in air, then in water. Find the specific gravity of the metal ( the ratio of the density of metal to the density of water). The tension of the block is measured 6.0N in air and 4.0N in water.
A jet airplane is in level flight. The mass of the airplane is m = 8850 kg. The plane travels at a constant speed around a circular path of radius R = 8.23 miles, What is the magnitude of the lift force acting on the plane
During a testing process, a worker in a factory mounts a bicycle wheel on a stationary stand and applies a tangential resistive force of 115 N to the tire's rim. what force must be applied to the chain
On a certain amusement park ride, passengers are seated in a horizontal circle of radius 7.5m. the seats begin to rotate from rest and are uniformly accelerated for 21 seconds to a most rotational speeds of 1.4 rad/s.
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. how many wavelengths are found within the laser pulse
A microscope with an 6.5-mm-focal-length objective has a tube length of 14.0cm. how far should the objective lens be from the specimen
At a certain point on Earth's surface in the southern hemisphere, the magnetic field has a magnitude of 4.9 10-5 T, What is the magnitude and direction of the force on the muon
Mars rotates on its axis once every 24.8 hours, its mass is 6.42×1023 kg and its radius is 3.37×106 m. Estimate the maximum speed that an astronaut can walk on the surface of Mars
A toy car of mass 2.0 kg is stationary and a child rolls a truck of mass 3.5kg straight toward it with a speed of 4.0 m/s. What are the velocities of the truck and the car
Mars has a small moon, Phobos, that orbits with a period of 7 h 39 min. What is the mass of Mars
An interstate highway has been built through a neighborhood in a city. In the afternoon, What is the average late-night sound level
A solid, uniform disk of radius 0.250 m and mass 61.6 kg rolls down a ramp of length 4.60 m that makes an angle of 16° with the horizontal. Find the angular speed of the disk at the bottom of the ramp
The voltage across a resistor is equal to the product of the current through the resistor and the resistance of the resistor, What is the potential difference of the battery
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