A person measures his heart rate by counting the number of beats in 30 s. if 33 ± 2 beats are counted in 30.0 ± 0.4 s, what is the heart rate and its uncertainty in beats per minute?

How do scientists use creativity in their careers? A Devising a hypotheses involves creating new explanations for phenomena. B The most important part of an experiment is how colorfully the data is displayed.

Which interaction of nature is weakest? a. strong c. electromagnetic b. weak d. gravitational

Which of the following cools the air in a household refrigerator? A. Absorption of the heat from the air due to evaporation of the liquid refrigerant B. Reduction of the air temperature due to condensation of the gaseous refrigerant C.

What item can be arranged to transform electrical energy to mechanical energy

Convert 525 pounds to kilograms using dimensional analysis setup

A Carnot engine has a power output of 148 kW. The engine operates between two reservoirs at 17◦C and 727◦C. How much thermal energy is absorbed each hour? Answer in units of J.

Which of the following tests is NOT a part of the Fitness Assessment?

A tuba creates a 4th harmonic of frequency 116.5 Hz. When the first valve is pushed, it opens an extra bit of tubing 0.721 m long. What is the new frequency of the 4th harmonic? (Hint : Find the original length.)

In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving source of sound. This is now known as Doppler's law or the Doppler effect. What does this law state?

Legend says that archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the water displacement method.