A4-m × 5-m × 6-m room is to be heated by a base-board resistance heater. it is desired that the resistance heater be able to raise the air temperature in the room from 5 to 25°c within 17 min. assuming no heat losses from the room and an atmospheric pressure of 100 kpa, determine the required power of the resistance heater. assume constant specific heats at room temperature.

Three archers each fire four arrows at a target. joe’s four arrows hit at points 10 cm above, 10 cm below, 10 cm to the left, and 10 cm to the right of the center of the target. all four of moe’s arrows hit within 1 cm of a point 20 cm from the center, and flo’s four arrows hit within 1 cm of the center. the contest judge says that one of the archers is precise but not accurate, another archer is accurate but not precise, and the third archer is both accurate and precise. which description applies to which archer? explain

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?