Which is a tool used by scientists to determine the composition of objects?

a hologram

a spectrometer

a wave front

a prism

An aluminium pot whose thermal conductivity is 237 W/m. K has a flat, circular bottom with diameter 15 cm and thickness 0.4 cm. Heat is transferred steadily to boiling water in the pot through its bottom at a rate of 1400 W.

What scientific practice is this? 1) collecting data 2) asking a question 3) providing explanations 4) communicating results

You have a three-year fixed rate lease of $750/month due to expire next month. Your landlord is willing to renew the three-year lease with a 4% total rent increase. What is your rent over the three-year life of the new lease?

Healthy blood vessels do what more easily? open close or move

What is the resistance of a 7 W light bulb connected to a 7 V battery source. The answer key says. 39 but not sure how they got that?

A projectile is launched over a horizontal surface in such a manner that its maximum height is 3/5 of its horizontal range. Determine the launch angle.

Two identical capacitors are arranged in a circuit. What is the ratio of the equivalent capacitance of the circuit when the capacitors are in series to that when they are in parallel?

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !