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Questions in physics

[Homework Help] A block sliding along a flat horizontal surface at an initial velocity of 2.0 m/s experiences a constant resistive force of 4.0 N that brings it to rest in a distance of 2.0 m. What is the mass of the block?

[Homework Help] Which formula can be used to express the law of conservation of momentum, where [tex]$p=$[/tex] momentum? A. [tex]$p_i=p_t$[/tex] B. [tex]$p_1\ \textgreater \ p_2$[/tex] C. [tex]$P_i\ \textless \ P_i$[/tex] D. [tex]$p_i \neq p_t$[/tex]

[Homework Help] A particle moves along a straight line relative to a fixed origin $O$ with acceleration, measured in $ft / s ^2$, given by the function $a(t)=20 t-12 t^2$, where $t$ is the time in seconds. If the particle has velocity $v=8 ft / s$ when $t=1 s$, calculate the speed of the particle at the moment $t=2 s$. a $30 ft / s$ b $10 ft / s$ c $12 ft / s$ d $8 ft / s$ e $2 ft / s

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

[Homework Help] Object A attracts object B with a gravitational force of 5 newtons from a given distance. If the distance between the two objects is reduced in half, what will be the changed force of attraction between them? A. 2.5 newtons B. 10 newtons C. 15 newtons D. 20 newtons E. 25 newtons

[Homework Help] Which best describes heat? A. energy that is carried by electric and magnetic fields B. energy that decreases as a car slows to a stop C. energy that increases as a book is lifted to a higher shelf D. energy that flows from a hot mug of tea to a cold hand

[Homework Help] A commonly used pentavalent material is: (a) Boron (b) Arsenic (c) Gallium (d) Neon

[Homework Help] Which one of these is true? (A) Motion is relative (B) Motion is not relative (C) Something is not in motion if its position with respect to the observer changes with time. (D) Both (A) and (B)

[Homework Help] The pressure [tex]$p$[/tex] of an ideal gas of density [tex]$p$[/tex] is given by the equation [tex]$p=\frac{1}{3} p\left(c^2\right)$[/tex] where [tex]$\left\langle c^2\right\rangle$[/tex] is the mean-square-speed (i.e. it is a quantity measured as [speed][tex]$^2$[/tex]?). Use base units to show that the equation is homogeneous.

[Homework Help] Convert the following Fahrenheit degrees to Celsius. 104°F