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Questions in physics

[Done] Which statement accurately describes the relationship between mass and weight? A) An object with twice the mass of another object will weigh half as much. B) An object with twice the mass of another object will weigh twice as much C) An object with twice the mass of another object will weigh four times as much. D) An object with twice the mass of another object will weigh one-fourth as much.

[Done] Choose the phrases that you think of when you hear the word Sun. Check all that apply. * center of the solar system * hot * sunbum * solar energy * star * source of energy for life * solar radiation

[Done] A 90 N force is applied to a 50 kg object. If the same force is applied to a 70 kg object, how will the acceleration of the two objects compare? Remember: [tex]F=m \cdot a[/tex] A. The 70 kg object will have greater acceleration. B. The 70 kg object will have smaller acceleration. C. The 70 kg object will have the same acceleration.

[Done] Abby has gotten in trouble with her physics teacher because she has failed to turn in her homework three times in the past month. She goes to his office to try to reason with him, but it is not effective. What should Abby have offered as a logical explanation? A. His homework assignments were unfair because he's mean-spirited. B. Experts believe that homework has no real value. C. She won't be able to support her family if she fails his class. D. She didn't understand the assignments and was embarrassed.

[Done] 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.

[Done] A 1000 kg car has a -5000 N net force exerted onto it. What is the acceleration of the car? [tex]a=[?] m / s^2[/tex]

[Done] Challenge The weight of an object is calculated using the formula [tex]W=m g[/tex], where: [tex]W[/tex] is the weight, in newtons (N) [tex]m[/tex] is the mass, in kg [tex]g[/tex] is the acceleration due to gravity, in [tex]m / s ^2[/tex] On Earth [tex]g=10 m / s ^2[/tex], and on the Moon [tex]g=2 m / s ^2[/tex]. The mass of a man is 75 kg and the mass of a lunar landing module is 10344 kg. a. Work out the weight of the: i. man on Earth ii. lunar landing module on Earth. b. Work out the weight of the: i. man on the Moon ii. lunar landing module on the Moon.

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

[Done] 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]

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