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Questions in physics

šŸ“ Answered - Two carts collide and bounce apart. Cart 1 had a momentum of [tex]$-6 kg \cdot m / s$[/tex] before the collision. Cart 2 had a momentum of [tex]$10 kg \cdot m / s$[/tex] before the collision. What is the total momentum of the carts after the collision? A. [tex]$-16 kg \cdot m / s$[/tex] B. [tex]$-10 kg \cdot m / s$[/tex] C. [tex]$4 kg \cdot m / s$[/tex] D. [tex]$10 kg \cdot m / s$[/tex]

šŸ“ Answered - A particle moves along a straight line relative to a fixed origin [tex]$O$[/tex] with acceleration, measured in [tex]$m / s ^2$[/tex], given by the function [tex]$a(t)=8 t^3-6 t$[/tex], where [tex]$t$[/tex] is the time in seconds. If the particle has velocity [tex]$v=-4 m / s$[/tex] when [tex]$t=2 s$[/tex], find the velocity (in [tex]$m / s$[/tex]) of the particle at time [tex]$t$[/tex]. a [tex]$v(t)=2 t^4-3 t^2-8$[/tex] b [tex]$v(t)=2 t^4-3 t^2-24$[/tex] c [tex]$v(t)=t^4-2 t^2-12$[/tex] d [tex]$v(t)=4 t^3-3 t-30$[/tex] e [tex]$v(t)=4 t^4-3 t^2-56$[/tex]

šŸ“ Answered - The particles of matter are: (a) Stationary (b) Continuously moving (c) Without any space between them (d) Immobile

šŸ“ Answered - When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force? A. the ball pushing on the person B. the ball pushing against air C. the ball being pulled toward the ground D. the ball being pulled away from the person

šŸ“ Answered - A particle moves along a straight line relative to a fixed origin $O$ with acceleration $a(t)=\sqrt{t^3}$, where $a(t)$ is measured in $m / s ^2$ and $t$ is measured in seconds. If the particle has velocity $v=0 m / s$ when $t=0 s$, calculate the speed of the particle at the moment $t=1 s$. a $\frac{5}{2} m / s$ b $\frac{2}{5} m / s$ C $\frac{2}{3} m / s$ d $\frac{3}{2} m / s$ e $\frac{1}{5} m / s

šŸ“ Answered - A stone is thrown with some initial speed vertically downwards from a tower of height 40 m. It strikes the ground in 2 s. What is the initial speed of the stone? (Take g = 10 m/sĀ²) (1) 5 m/s (2) 15 m/s (3) 20 m/s (4) 10 m/s

šŸ“ Answered - A car has a mass of $1.00 \times 10^3$ kilograms, and it has an acceleration of 4.5 meters/second ${ }^2$. What is the net force on the car? A. $0.9 \times 10^3$ newtons B. $2.5 \times 10^3$ newtons C. $4.5 \times 10^3$ newtons D. $9.0 \times 10^3$ newtons E. $9.6 \times 10^3$ newtons

šŸ“ Answered - Which of the following statements correctly describe the relationship between theories and experiments? Select all that apply. A. It is of no consequence when experimental results contradict a theory, since it is only a theory. B. If a theory is disproved by experiment, it must be modified or discarded. C. Experiments are regularly used to test the predictive ability of a theory. D. Since a theory is not an established fact, it is unrelated to experimentation.

šŸ“ Answered - Which statement is best supported by the table? | Wave | Observations | |---|---| | W | Its motion is perpendicular to wave motion. | | X | Its particles move up and down. | | Y | Its particles only move small amounts. | | Z | Its motion is parallel to wave motion. | A. Waves W and Y are transverse waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave. B. Waves W and Y are longitudinal waves, Wave X could be a longitudinal or transverse wave, and Wave Z is a transverse wave. C. Waves W and X are longitudinal waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a transverse wave. D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave Z is a longitudinal wave.

šŸ“ Answered - Which material may also be considered a semiconductor element? (a) Carbon (b) Argon (c) Ceramic (d) Mica