A train is moving 35 m/s to the east. It speeds up to 42 m/s east over the

course of 40 seconds. What was the train's acceleration?

O A. 0.175 m/s2 west

O B. 5.71 m/s2 east

O C. 5.71 m/s2 west

O D. 0.175 m/s2 east

Which material is the best heat insulator? metal wood plastic glass

What are some examples of tools or objects that apply force?

What happens when a negatively charged object A is brought near a neutral object B? A Object B gets a negative charge B. Object B gets a positive charge. Cobject B stays neutral but becomes polarized. D. Object Agets a positive charge.

How would an astronomer explain the difference between the two spectra? A. Hydrogen gives off light differently if star is more distant B. Light traveling through space is warped by the vacuum C.

The equation for density is mass divided by volume if you pack more mass into a certain volume the density will? A: increase B: decrease C: stay the same

Technician A says that all friction and steel plates in a clutch pack should be replaced during and overhaul. Technician B says that the automatic transmission fluid cooler should always be flushed when a unit is rebuilt or replaced.

Cold water (cp = 4180 J/kg·K) leading to a shower enters a thinwalled double-pipe counterflow heat exchanger at 15°C at a rate of 1.25 kg/s and is heated to 60°C by hot water (cp = 4190 J/kg·K) that enters at 100°C at a rate of 4 kg/s.

Determine the magnitude of the acceleration for the speeding up phase.

The experimenter fom the video rotates on his stool, this time holding his empty hands in his lap. You stand on a desk above him and drop a long, heavy been bag straight down so that it lands across his lap, in his hands. what happens?

Manufacturer claims its cleanser works twice as fast as any other. What tests could be performed to support this claim? Explain your reasoning.