Superman needs to help a construction worker and lifts a 425 kg steel beam vertically upward a distance of 117 m. How much work does Superman do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces. A. 4.0x105 J B. 3.4x105 J C. 5.8x105 J D. 4.9x105 J

With i really need the correct answer!

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?