A student discovers a comet heading toward the Sun. The student records the initial distance from the Sun as 'd' while recording the initial mass of the
comet as 'm' which resulted in a gravitational force of 'F'. Further
observation of the comet shows that as it reaches a positon d/2, the mass
of the comet has been reduced to 1/3 of its original mass. Which
expression best represents the value of the gravitational force at d/2?

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.