If the emf produced in a wire is 0.88 volts and the wire  moves perpendicular to a magnetic field of strength  0.075 newtons/amperes·meter at a speed of  4.20 meters/second, what is the length of the wire in  the magnetic field? 0.27 meters 2.8 meters 0.020 meters 3.7 meters

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

The table below shows the acceleration of gravity on different bodies in the solar system. on which body would a 10 kg lamp has the most gravitational potential energy when lifted to a height of 2 m? a. earth b. mars c. neptune d. uranus