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A car of mass 3.0 x10^3 kg traveling at a speed of 20 m/s is passing a truck of mass 7.0x10^3 kg traveling at a speed of 10 m/s in the same direction along the same straight line. Calculate the speed of the center of mass of this system.
How many 95W light bulbs can you use in a 120V circuit without tripping a 17A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each light bulb is V.)
The initial speed of a cannon ball is 0.20 km/s. what is the minimum time of flight for the ball
A beam of particles is directed at a 0.017-kg tumor. There are 2.1x10^10 particles per second reaching the tumor, Find the biologically equivalent dose given to the tumor
What is the longest wavelength of light capable of ionizing a hydrogen atom in the n = 2 state
A 100 W lightbulb produces 4.0 W of visible light. What is the light intensity on a wall 3.0 m away from the lightbulb
A 6.4kg ball, hanging from the ceiling by a light wire 135cm long, is struck in an elastic collision by a 1.80 ball moving horizontally at 4.20 m/s just before the collision. Find the tension in the wire just after the collision.
A concave mirror is of hemisphjerical shape with radius 40cm. A thin layer of unknown transparent liquid is poured into mirror. The mirror liquid forms a real image and another real image is formed by the mirror alone.
A rollercoaster with passengers has a mass of 2500 kg. This rollercoaster is powered to the top of a 25 m hill where it pauses for a moment at rest. What is the speed of the rollercoaster at the top of the vertical loop
If the current price of July WTI futures is $87 and the strike price is $86, illustrate what is the intrinsic value of this call? Illustrate what is the time value?
The current through a 908 ohm resistor is 189 mA; to the nearest volt, what is the potential difference across the resistor
A particle moves along the x axis. Its position is given by the equation 2.00 + 3.00t - 4.00t^2 with x in meters and t in seconds. Find out (1) its position at the instant it changes direction and (2) its velocity when it returns to the position i..
A student sits on a rotating stool holding two 3.5 kg objects. When his arms are extended horizontally, Find the kinetic energy of the student before and after the objects are pulled in
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