Which of the options is the best definition of a vector?A.a specific type of imaginary number
B.a quantity with both magnitude and direction
C.a magnitude described as a number
D.the magnitude of a value

Answer:

Car C

Explanation:

It is given that,

Five race cars speed toward the finish line at the Jasper County Speedway. The mass of each car has same mass. The speed of all cars are given as :

Car A = 890 m/s

car B = 850 m/s

Car C = 790 m/s

Car D = 895 m/s

Car E = 870 m/s

The distance is constant because the finish line is same for all cars. The speed of an object is given by the total distance covered divided by total time taken i.e.

Where

d = distance

t = time required by the car to come to a full stop

So, time taken is inversely proportional to the speed of the car. The car having less speed will take maximum time to come to stop. Hence, car C will require longest time to come to a full stop.    

Answer:

Car D

Explanation:

The mass of the car is given the same. The initial velocities are also given. eventually all the cars come to a stop. The finish line would be crossed first by the fastest car. But If all the cars decelerate at the same rate then, we can find out the time taken to come to a full stop by first equation of motion,

final velocity, v = 0

if a is same for all cars.

Car D has maximum speed ( 895 m/s). So, Car D will take the maximum time to come to a stop.

Answer:

C. nuclear fusion.

Explanation:

The core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat and photons (light). The sun's surface is about 6,000 Kelvin, which is 10,340 degrees Fahrenheit (5,726 degrees Celsius).

Final Answer:

To determine if the strength of the electric field decreases as 1 over distance squared (1/r²), we need to measure the electric field at 0.5 m and 1 m directly above the midpoint of a small dipole created by two charges brought very close together.

Explanation:

In this experiment, you're examining the electric field generated by a small dipole. The electric field strength at a distance from a dipole does follow an inverse square law, as suggested by 1/r², which is a fundamental principle of electrostatics. This means that the electric field's strength decreases as you move farther away from the charges.

To verify this, you'll measure the electric field at two different distances (0.5 m and 1 m) directly above the midpoint of the dipole. By comparing these measurements, you can assess whether the field strength obeys the 1/r² relationship. The electric field strength should be four times stronger at 0.5 m than at 1 m if it follows the 1/r² law.

This experiment provides hands-on insight into the behavior of electric fields and their relationship to distance, supporting the foundational principles of electrostatics.

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The types of meteorites are iron, stone and iron-stony meteorites. The stony-iron meteorites account for less than 2% of all known meteorites. They comprised of roughly equal amounts of nickel-iron and stone and are divided into two groups: pallasites and mesosiderites. The answers are only B and C