How much force does an object with mass of 100 kg need to accelerate at 18 m/s2

A 58.5 kg sprinter starts a race with an acceleration of 4.40 m/s2. What is the net external force on him? Give the equation used to find the net force on an object in terms of its mass (m) and its acceleration (a).

If you lived on the Moon, would you see Earth go through phases? If so, would the sequence of phases be the same as those of the Moon as seen from Earth, or would the sequence be reversed? Explain.

Tell the order of vessels a blood cell travels through

A 20000 kg subway train initially traveling at 18.5 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station's dimensions are 65.0 m long by 20.0 m wide by 12.0 m high.

Why are most large astromical telescopes reflecting telescopes rather than refracting telescopes?

What happens if a hypothesis is not supported?

a group of elements that stretch bend and conduct heat and electricity

A rectangular block has dimensions 2.9 cm x 3.5 cm x 10.0 cm. the mass of the block is 615.0 g. what is the volume and density of the block? (answer it with correct numbers of significant figures)

Which of the following are products of cellular respiration? Sunlight Oxygen ATP Water Carbon Dioxide

Do magnetic field lines ever start or end anywhere?