Recent content by gcombina

the length of the other side would be 90 meters which equates to 90N

Homework Statement A horizontal, 10-m plank weighs 100 N. It rests on two supports that are placed 1.0 m from each end as shown in the figure. How close to one end can an 800-N person stand without causing the plank to tip? Homework EquationsThe Attempt at a Solution This is kind of...

Homework Statement Which statement concerning a wheel undergoing rolling motion is true (a) The angular acceleration of the wheel must be zero m/s2. (b) The tangential velocity is the same for all points on the wheel. (c) The linear velocity for all points on the rim of the wheel is non-zero...

θ = ω t + 1/2 t^2 that one

angular acceleration = change in angular velocity/time =(final ang vel-initial ang vel)/time here, initial ang vel =0 final ang vel = 20 rev/s = 125.6 rad/s (there are 2 pi radians/rev) so, ang accel = (125.6rad/s)/8s=15.7rad/s/s or I still don't have the answer!

Homework Statement A grindstone, initially at rest, is given a constant angular acceleration so that it makes 20.0 rev in the first 8.00 s. What is its angular acceleration? (a) 0.313 rad/s2 (c) 2.50 rad/s2 (e) 3.93 rad/s2 (b) 0.625 rad/s2 (d) 1.97 rad/s2Homework Equations...

Homework Statement Which equation is valid only when the angular measure is expressed in radians? a) α = Δθ / Δt b) ω= Δω / Δt c) ω^2 = ωo^2 + 2αθ d) ω = Vt/r (here T is a subscript) e) θ = 1/2αt^2 + ωαt Answer is D but why?? Homework Equations I know angles can be measured in either...

oh shoot should i use the third law of Newton? action/reaction?

because they are both at different directions, the force going to the right will cancel the force going to the left. The velocities will cancel, leaving the vehicles at zero speed

right and my thought is that both velocities will cancel each other and be zero but its wrong, can u help me? my test is on Monday

no, what you are reading is all they have given me

Homework Statement Two objects of equal mass traveling toward each other with equal speeds undergo a head on collision. Which one of the following statements concerning their velocities after the collision is necessarily true? (a) They will exchange velocities. (d) Their...

wow, i don't understand you. Which option are you trying to explain to me? option a) or option e)?

right cause the conservation of momentum, am I right? velocity is zero before and its zero after

I thought that because it said "stationary bomb" then the velocity was zero before it exploted