Achild on a playground swing is swinging back and forth (one complete oscillation) once every four seconds, as seen by her father standing next to the swing. at the same time, a spaceship is hurtling by at a speed close to the speed of light. according to special relativity (and ignoring the doppler effect for this question), her mother on the spaceship finds that the time for one full swing is
a) less than four seconds when the spaceship is approaching the swing and longer than four seconds when it is moving away.
b) less than four seconds.
c) equal to four seconds.
d) longer than four seconds.

Orque can be calculated by multiplying the force (n) applied at 90? to the lever arm at a distance (m) from the pivot point (point of rotation), the compound si unit for the torque is n? m. if the force (at 90? to the lever arm) applied is 15 n and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you