Ebuah kereta maglev (magnetic levitation train) bermassa 70 ton digunakan untuk transportasi koloni di mars sepanjang amazonis planitia yang terbentang sekitar 1183 km. jika percepatan gravitasi mars gmars = 3,73 m/s², arus yang digunakan sebesar 7 ampere, maka kuat medan magnet minimum yang diperlukan agar kereta tersebut tetap terapung sepanjang perjalanan t

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.