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Velocity has a magnitude and a vector. consider a boat moving initally with velocity of 30 m/s directly west. at some later instant the boat is found to have a velocity of 12 m/s at 30* S of W. What is the change in velocity? give the magnitude in m/s only?
A sport utility vehicle (SUV) and a sports car travel around the same horizontal curve. The SUV has a static stability factor of 0.74, At what maximum speed can the sports car negotiate the curve without rolling over
The potential difference between the surface of a 3.1 cm diameter power line and a point 1.8 m distant is 5.0 kV. What is the line charge density on the power line
A uniform electric field of magnitude 445 N/C pointing in the positive x-direction acts on an electron, that is initially at rest. The electron has moved 3.10 cm.
A satellite circles the earth in an orbit whose radius is 3.26 times the earth's radius. What is the period of the satellite
An airplane travelling 1001 m above the ocean at 125km/hr is to drop a box of supplies to shipwrecked victims below. How various seconds (t) before being dropped directly overhead should the box be dropped.
A 50 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact (a) if the dancer is stationary and (b) if dancer is lea..
An object is placed 50 cm in front of a convex mirror and its image is found to be 20 cm behind the mirror. What is the lateral magnification
A snowball rolls off a barn roof that slopes downward at the angle of 40 ^circ. The edge of the roof is 14.0 {rm m} above the ground, and the snowball has a speed of 7.00 {rm m/s} as it rolls off the roof. Ignore air resistance.
The position function x(t) of a particle moving along an x axis is x = 4.0 - 4.5t2, with x in meters and t in seconds. At what negative time does the particle pass through the origin
An insect 4.00mm tall is placed 20.0cm to the left of a thin planoconvex lens. Calculate the location of the image this lens forms of the insect
A 186 watt motor is used to lift a 114kg container to a height of 6m. How much time does it take to lift the container with the motor.
Unpolarized light passes through five successive Polaroid sheets, What is the intensity of the transmitted beam
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