First, they measured the mass and temperature of a sample of water in a calorimeter. Then, they heated the 100 g metal sample in a beaker filled with boiling water and waited until the metal sample reached 100°C. They transferred the metal sample into the calorimeter and placed the lid on the calorimeter. They stirred until the temperature no longer changed, and the water and metal reached equilibrium. They repeated the procedure with a 200 g, 300 g, 400 g, and 500 g sample of the metal.
(The specific heat of water equals 4.18 joule/gram °C. )

What is the specific heat of the masses in this experiment? Infer the substance the masses are made of and explain your inference using the data as support. Based on your calculation of the metal's specific heat, what is the metal? Show your work.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.