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A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.23-kg plate of food and a 0.249-kg cup of coffee. Obtain
(a) the force exerted by the thumb and
(b) the force exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground.
Dan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground
A light string can support a stationary hanging load of 23.0 kg before breaking. What range of speeds can the object have before the string breaks
A molecule consists of two atoms. How far from the first atom is the center of mass of the molecule
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.06 cm. If the spring constant is 260 N/m and the mass is 0.470 kg, determine the mechanical energy of the system
Does the level of social responsibility exhibited by Starbucks have any effect on how other coffee retailers are viewed?
A two-stage rocket moves in space at a constant velocity of 4900 m/s. What is the velocity of the 2400 kg lower stage after the explosion
A stone dropped into a pond generates a travelling wave group approximately 1 m long; the waves within the group have a wavelength of about .1 m Estimate the range of the wavevector spectrum representing the group.
A 3.50-g bullet, traveling at 250 m/s, hits a hinged, light board at right angles, at a distance of 55.0 cm from its hinges, What is the angular speed of the board
A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. How long is he in the air
Describe the motion of a ball in a bus when the bus accelerates foward as it might be perceived by a person standing on the ground outside the bus
What is the magnitude of the acceleration of rock.
Expand Lagrangian to second order about equilibrium coordinates, r_0, phi = wt and find the condition for stability against small oscillations.
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