Outside the space shuttle, you and a friend pull on two ropes to dock a satellite whose mass is 900 kg. the satellite is initially at position < 3.2, -1.5, 2.2> m and has a speed of 4 m/s. you exert a force < -400, 500, 350> n. when the satellite reaches the position < 2.0, 2.4, 4.0> m, its speed is 5.56 m/s. how much work did your friend do?

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.