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Questions in physics

[Answered] In 45 seconds, a rocket goes from traveling at [tex]$75 m / s$[/tex] to [tex]$570 m / s$[/tex]. What is the acceleration of the rocket? [tex]$a=[?] \frac{m}{s^2}$[/tex] Enter the sign (+ or -) and the magnitude. Remember: [tex]$a =\frac{\Delta V }{ t }$[/tex]

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] The surface area of a small piston is $\frac{1}{10}$ the surface area of a large piston. Find the input force if the output force is $20,000 N.

[Answered] Including reaction time, the stopping distance is more than 20 feet at 10 miles per hour. At 20 miles per hour it will be about: A. 30 feet B. 63 feet C. 40 feet D. 75 feet

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] What force makes a football move when you throw it? A. weak force B. contact force C. friction D. gravitational force

[Answered] Moving objects, such as automobiles, have kinetic energy (KE), which is measured in joules. This energy can be calculated using the following formula: [tex]$KE=\frac{1}{2} m v^2$[/tex] A person drives an automobile with a mass of 450 kilograms at a velocity of 26 meters per second. The driver accelerates to a velocity of 30 meters per second. The difference in the automobile's kinetic energy between the two velocities is $\square$ joules.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] The color of light can be expressed in terms of either frequency ( [tex]$v$[/tex] ) or wavelength ( [tex]$\lambda$[/tex] ), which has units of nanometers ( [tex]$nm$[/tex] ). The equation that relates the frequency and wavelength of light with the speed of light [tex]$(c)$[/tex] is: [tex]$v=\frac{c}{\lambda}$[/tex] The speed of light is a constant and approximately equal to [tex]$300,000,000$[/tex] meters per second. Green lasers emit light at a wavelength of [tex]$532 ~ nm$[/tex]. However, the material that is used to make most green lasers does not emit light at 532 nm. Instead, it emits light at a different wavelength, and the laser then uses a "frequency doubler." This doubles the frequency of the emitted light, and the resultant light is the green 532 nm that we observe. 1 meter is equal to [tex]$1,000,000,000$[/tex] nanometers. What is the output light frequency of the material used before doubling? You may use the calculator. A. [tex]$1.8 \times 10^{14} Hz$[/tex] B. [tex]$2.8 \times 10^{17} Hz$[/tex] C. [tex]$5.6 \times 10^{14} Hz$[/tex] D. [tex]$1.11 \times 10^{16} Hz$[/tex]

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?