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A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.167 kg, and its center of gravity is located at its geometrical center. On the tray are a 1.11-kg plate of food and a 0.262-kg cup of coffee. Get (a) the force exerted by the four fingers (b) the force exerted by the thumb. Both forces act perpendicular to the tray, which is being held parallel to the ground.
Two identical mandolin strings under 200 N of tension are soundingtones with frequencies of 455 Hz. How many beats per second are heard
A hypodermic needle is attached to a syringe with a plunger of diameter 1.6 cm. What is the minimum force must be applied to the plunger
when a 50 mf capacitor is attached to an ac source its capacitive reactance is 40 ohms. if instead a 100 mf capacitor
The right-side rearview mirror of Mike's car says that objects in the mirror are closer than they appear. Mike decides to do an experiment to determine the focal length of this mirror. What is the focal length of the rearview mirror
a block-spring system oscillates with an amplitude of 3.40 cm. the spring constant is 250 nm and the mass of the block
A rotating wheel requires 3 s to rotate 37 revolutions. Its angular velocity at the end of 3 s interval is 98 rad/s. What is the constant angular acceleration for the wheel
A 15 kg block is dragged over a rough horizontal surface by a 70Nforce acting at 20 degrees above the horizontal. The block isdisplaced 5 m, Calculate the work done by the block by the normal force
Imagine two 1.5 bags of protons, one at the earth's north pole and the other at the south pole. A. Calculate the gravitational attraction that each bag exerts on the other.
At its farthest point, the three-point line is 7.24 metersaway from the basket in the NBA. At what speed Should he throw the ball
determine the effect of nuclear mass on the first line of the balmer series of hydrogen by calculating its wavelength
A physicist uses a cylindrical metal can 0.300m high and 0.070m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09×104J/kg. How much helium is lost per hour
A particle of 8 kg with a veloctiy of 40 m/s hits a 40 kg particle that is at rest. The collision is elastic. What are the final velocities of the particles
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