A researcher is investigating new solar technology. The researcher looks at combinations of solar panels and solar rechargeable batteries that were provided from research labs A, B, C and D. The combinations of solar panels and solar rechargeable batteries are measured for their efficiency, the amount of time it takes to fully charge a battery, and the life of each fully charged battery used to power a home. The experiments were conducted using a UV light. The batteries recharge when the solar panels are exposed to UV light and are depleted of charge when being used for power. The solar panels will not recharge the batteries on cloudy days.  

If the researcher could combine the solar panel from one of the labs with the batteries from another lab, then which combination would give the highest efficiency and longest battery life? Assume that the solar panels and batteries are all compatible with no adverse effects.

A researcher is investigating new solar technology. The researcher looks at combinations of solar panels and solar rechargeable batteries that were provided from research labs A, B, C and D. The combinations of solar panels and solar rechargeable batteries are measured for their efficiency, the amount of time it takes to fully charge a battery, and the life of each fully charged battery used to power a home. The experiments were conducted using a UV light. The batteries recharge when the solar panels are exposed to UV light and are depleted of charge when being used for power. The solar panels will not recharge the batteries on cloudy days.  

If the equipment from research lab D was under the same UV light as in the experiment, what is the expected percent efficiency? 

Engineers are evaluating four potential technologies. These technologies are to be used as power plants that are considered "clean" energy. The estimated energy output of these plants were calculated and the resources needed to run these were also listed. 

If all other resources are readily available, which technology should be pursued in costal communities?

A company developed new prototype car and wanted to test the new car. The car's acceleration time from 0mph to 60mph and stopping time from 60mph to 0mph were measured. An obstacle course involving a lot of turns was also constructed to determine how well the car can handle turning. The main concern of the company is the safety of the car and therefore all of the tests were performed on dry concrete, concrete after simulated rain, concrete that was covered with snow and in sand.  

What is true about the acceleration time and stopping time? 

A company developed new prototype car and wanted to test the new car. The car's acceleration time from 0mph to 60mph and stopping time from 60mph to 0mph were measured. An obstacle course involving a lot of turns was also constructed to determine how well the car can handle turning. The main concern of the company is the safety of the car and therefore all of the tests were performed on dry concrete, concrete after simulated rain, concrete that was covered with snow and in sand. 

In order for the car to be safe on the roads, it is necessary for the car to have a stopping time of 4.5 seconds. What surfaces would the car not be safe on? 

A student is performing a science experiment for his class. The student creates a ramp that contains four different surfaces, carpet, glass, wood and plastic. The ramp is held at a constant angle and a ball is allowed to roll down the ramp. The student tests each material by releasing a ball at different distances from the bottom of the ramp and recording the time it takes for the ball to travel the distance of the ramp. 

What surface causes the least amount of friction? 

Two scientists are concerned with producing electricity with magnets.

Scientist 1 believes that rotating a magnet within a coil of wires will produce electricity. Scientist 1 asserts that the larger the magnet the more electricity will be produced. 

Scientist 2 believes that rotating the coil of wires around a magnet will produce electricity. Scientist 2 asserts that the more number of coils the more electricity will be produced. 

The scientists conduct the following experiment. The scientists take four magnets, A, B, C and D; with A being the smallest magnet, B the next smallest, then C and the largest magnet was D. The scientist rotate the magnets at the same constant speed in the coils and record the number of milliamps produced. This was done in copper wiring with 20, 40 and 60 coils. When testing by rotating the coil around the magnet at the same speed of the magnet rotation produced the results recorded below.

How many more coils are needed around magnet A so that it will produce the same current as in experiments with magnet D? 

A student is performing a science experiment for his class. The student creates a ramp that contains four different surfaces, carpet, glass, wood and plastic. The ramp is held at a constant angle and a ball is allowed to roll down the ramp. The student tests each material by releasing a ball at different distances from the bottom of the ramp and recording the time it takes for the ball to travel the distance of the ramp. 

If the ball released on the glass surface was to travel a distance of 50cm, about how long, in seconds, will it take for the ball to reach its destination? 

Two scientists are concerned with producing electricity with magnets.

Scientist 1 believes that rotating a magnet within a coil of wires will produce electricity. Scientist 1 asserts that the larger the magnet the more electricity will be produced. 

Scientist 2 believes that rotating the coil of wires around a magnet will produce electricity. Scientist 2 asserts that the more number of coils the more electricity will be produced. 

The scientists conduct the following experiment. The scientists take four magnets, A, B, C and D; with A being the smallest magnet, B the next smallest, then C and the largest magnet was D. The scientist rotate the magnets at the same constant speed in the coils and record the number of milliamps produced. This was done in copper wiring with 20, 40 and 60 coils. When testing by rotating the coil around the magnet at the same speed of the magnet rotation produced the results recorded below.

How can the highest current be produced as supported by the experiment?

Metal wires are often used to conduct electricity. The electricity that flows through a wire is measured as "current." Therefore, a wire with an electric current is called a current carrying wire. 

Current carrying wires also have a tendency to produce magnetic fields that circulate around them. The strength of that magnetic field is determined by the following equation where  is the magnetic field strength (Teslas),  is the electric current (Amps),  is the distance (meters) of an object to the current carrying wire.  is a constant.

Based on the given equation, what is the relationship between the strength of a magnetic field of a current carrying wire and that wire's electric current.