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Aircraft equipped with powerful radar units are forbidden from turning them on when on the ground near people. Explain why this is so.
find out the speed of the test charge. How many electrons should be removed from A and put onto B to make the electrostatic force that acts on each object an attractive force whose magnitude is 23.6 N.
A prescription for a corrective lens calls for + 3.20D . The lensmaker grinds the lens from a "blank" with n = 1.56 and a preformed convex front surface of radius of curvature of 35.0cm . What should be the radius of curvature of the other surface..
A particle with a mass of 2.0 x 10-5 kilogram and a charge of +2.5 μC is released in a (parallel plate) uniform horizontal electric field of 10 N/c. Find the horizontal component of its velocity at that point
A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 5 excited state. The atom returns to the ground state by emitting two photons, one in dropping to n = 4 state, and one in further dropping to the ground state..
A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the accelera..
If a car traveling at 62 km/h will skid 22 m as its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock.
Two metal plates are held together by two steel rivets, each of diameter 0.24cm and length 1.2cm.How much force has to be applied parallel to the plates to shear off both rivets.
The human visual resolution is 1 minute of arc. Assuming that you are looking down an isolated road at night. at what distance can you distinguish the two headlights of an approaching car?
Two energy reservoirs are at 20 degrees Celsius and 827 degrees Celsius. How much energy does this engine extract from the hot reservoir to do 3500 J of work
When a 0.31-kg mass is attached to a vertical spring, the spring stretches by 15 cm. How much mass (total) must be attached to the spring to result in a 0.53-s period of oscillation
Compute the linear momentum and angular momentum of a Frisbee of mass 0.130 kg if it has a linear speed of 1.25 m/s and an angular velocity of 62.5 rad/s
What is the maximum angular speed reached by the flywheel? Determine the ratio of the number of revolutions made during spin-up to the number made during spin-down.
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