Iposted this earlier but got a confusing answer so pls as best as u can asap!
true or false 1. if a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 n.
(1 point) true false multiple choice 2. how much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s2? (1 point)
62 n 62 kg 120 n 120 kg 3. what is the acceleration of a 30 kg object when 180 n of force is applied to it? (1 point)
6.0 m/s^2 60 m/s^2 210 m/s^2 5,400 m/s^2 4. which of the following equations shows how you would solve for mass if you knew the force acting on an object and the acceleration of an object?
(1 point) m = f/a m = fa m = a/f m = f − a s need ! dunno what they are talking about! cant guess!
pls ! thanx in advance

An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt, c and rt, h, and qin, as where rtot rt, c rt, h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc, n 0.05 k/w and rh, n 0.04 k/w, respectively. over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh, d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th, i tc, i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc