How Do We Know What the Sun is Made of? And ... Will it ever run out of its fuel?

Which can hold more water, warm or cold air?

As an astronaut, you observe a small planet to be spherical. After landing on the planet, you set off, walking always straight ahead, and find yourself returning to your spacecraft from the opposite side after completing a lap of 25.1 km.

If the wavelength of the red line of hydrogen coming from a galaxy is 654.3 nanometers instead of the normal 656.

Which of these is an example of pseudoscience? chemistry astrology astronomy mathematics

What is a descriptions of an animal cell's nucleus?

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.