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1. The quantity called mass density is the mass per unit volume of a substance. Express the following mass densities in SI units.
a) Aluminum, 2.7x10^-3 kg/cm^3 b) Alcohol, 0.81g/cm^3
2. A rock is tossed straight up with a velocity of 23 m/s When it returns, it falls into a hole 10m deep.
Part A. What is the rock's velocity as it hits the bottom of the hole?Part B. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
A particle moving along the x-axis has its position described by the function x =( 3.00 t^{3}- 5.00 t+ 5.00 )\; {\rm m}, where t is in s. At t= 4.00, what are the particle's (a) position, (b) velocity, and (c) acceleration?
A uniform plank of length 4.3m and weight 236N rest horizontally on two supports, with 1.1m of the plank hanging over the right support. To what distance x can person who weighs 450N walk on the overhanging part of the plank before it just begins ..
What angle did the hawk make with the horizontal throughout its descent? For how long did the mouse enjoy the free fall.
At what speed do a bicycle and its rider, with a combined mass of 100-kg, have the equal momentum as a 1500 kg car travelling at 5 ;{ rm m}/ {rm s}.
What is the net electric force acting on particle.
A constant horizontal force a pushes a kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. package's x and y velocity components versus time t.
A charge of -5 micro-coulombs is placed at x = 0 cm, y = 0 cm. Another charge of -5 micro-coulombs is placed at x = +22 cm, y = -50 cm. When measured counter-clockwise from the x axis, what angle is the electric force vector acting on the charge a..
.A cosmic-ray proton in interstellar space has an energy of 10.0 MeV and executes a circular orbit having a radius equal to that of Mercury’s orbit around the Sun (5.80 m). Illustrate what is the magnetic field in that region of space?
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change.
A trombone has an effective length of 160 cm and the speed of sound in air is 345 m/s. Notes are selected by moving a U-shaped tube in or out to change effective length of the trombone.
An infinitely long wire is formed as in the diagram on your assignment. It is formed so that it has a circular portion of R = 50cm and the straight portion is located at a distance r from the center of the circular portion. Determine r (in cm) suc..
A space traveller whose mass is 104kg leaves earth. What are his weight and masson earth and in interplanetary space where there are no near planetary objects.
Find the power in sideband, total power, carrier power, carrier rms voltage and the peak voltages for carrier and sidebands of AM transmitter.
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