Why aren’t hydrogen fuel cell cars currently available to the public? they produce more noise pollution than other cars. they have had unpredictable electrical problems. they have not yet been driven over long distances. they require more testing in real-world conditions.

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?