Suppose you are traveling in a bus that has a mass of 125kg at a highway speed of 45km/s for 10s on a nice summer day and the momentum, 250kg. m/s, of an unlucky bug with a mass of 25kg is suddenly changed as it splatters onto the front window.
This is NOT a multiple-choice question Answer all questions (1-4)
1.
Compared to the force that acts on the bug, how much force acts on the bus? (Find the speed of both the
you need acceleration!) F-MA
bus and bug. Remember:
2.
Although the momentum of the bus is very large compared to the momentum of the bug, explain the change
compared to the change in momentum of the bug.
in momentum of the bus
3.
Which of the two experiences the greater acceleration
4.
Which, therefore, would suffer the greater damage and why?
I

What happens to the light rays when they hit the specimen?

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

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?