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An object moves at a constant velocity of 11 m/s to the southwest for an inverval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?
q1. two ocean liners each with a mass of 38000 metric tons are moving on parallel courses 92 m apart. what is the
A uniform electric field of magnitude E = 490 N/C makes an angle of ? = 60.0° with a plane surface of area A = 3.90 m2
A 47 kg person, standing 0.980 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 3.10 m/s relative to the ground. Find resulting angular speed (in rad/s) of the disk.
Can you please help me set this problem up? Suppose that now you want to make a scale model of the solar system using the ball bearing .0014 m to represent the sun. (a) How far from it would you place a sphere representing the earth?
A heat engine absorbs 2400 J of heat from a hot reservoir and releases 1400 J of heat to a cold reservoir each second. Find the efficiency of the engine and its mechanical power output
Pete slides a crate up a ramp with constant speed at an angle of 27 degrees by exerting a 133 N force parallel to the ramp. How much work has been completed against gravity when the crate is raised a vertical distance of 1.6 m? The coefficient of fri..
In a certain time, light travels 4.78 km in a vacuum. During the same time, light travels only 2.37 km in a liquid. What is the refractive index of the liquid
How large does the radius R of the dish have to be to attain electric field vector amplitude of 0.1mV/m at the receiver.
Parallel conducting tracks, separated by 2.79 cm, run north and south. There is a uniform magnetic field of 1.27 T pointing upward (out of the page). What is the direction of the magnetic force on the rod
a cube of wood floating in water supports a 200g mass at the centre of its top face. when the mass is removed, the cube rises by 2cm. determine the volume of the cube
A glider with mass m = 0.240 kg sits on a frictionless horizontal air track, connected to a spring with force constant k= 5.00 N/m. What must the initial displacement of the glider be if its maximum speed in the subsequent motion is to be 3.00 m/s
question1a current of 1a is injected into the earth at the bottom of a borehole. derive an expression for the voltage
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