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Object A is acted on by only object B. The mass of object A is 20.0 kg and its acceleration is 4.00 m/s2 west. Object B is acted on by two forces, the force of object A on object B and another unknown force. If mass of object B is 40.0 kg and the acceleration of object B is 3.00 m/s2 west, what is the unknown force?
question a child throws a ball downward from a tall building. note that the ball is thrown not dropped and disregard
Two point charges lie along the y axis. A charge of q1 = -12.0 µC is at y = 7.0 m, find the point at which the total electric field is zero
At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 1.8 m/s2. How fast will the automobile be traveling at that instant
A light bulb is wired in series with a 131-? resistor, and they are connected across a 120-V source. What are the two possible resistances of the light bulb
In an insulated vessel, 260 g of ice at0°C is added to 630 g of water at19.0°C. What is the final temperature of thesystem? How much ice remains when the system reaches equilibrium?
A sprinter explodes out of the starting block with an acceleration of +3.5 m/s2, which she sustains for 1.0 s. What is her velocity at the end of the race
Calculate and compare the electron densities of a piece of aluminum 1 cm thick and a piece of iron of the same density thickness. Show your work & please be sure to compare.
A physics demo launches a ball horizontally while dropping a second ball vertically at exactly the same time. [Delayed Feedback] 1) Which ball hits the ground first?
A 7.57- g bullet is moving at 689.00 m/s as it leaves the 0.63- m-long barrel of a rifle. What is the average force on the bullet
an airplane flies in a horizontal circle of radius 4000 m at aconstant speed of 100m/s. The mass of the pilot is 63 kg. What is the net force on the pilot when the airplane isdirectly east of the circle's center
A magnetic field of 3 Tesla is oriented into the page. A 10 cm long conducting bar is pulled to the right at a constant speed of 3.4 m/s. What is the power supplied by the person pulling the bar
Consider the central peak in the diffraction envelope in the figure below. Suppose the wavelength of the light is changed to 450 nm. What happens to this central peak?
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