Homework Statement
A ball traveling in a straight line, colides with the end of a pole on a centre pivot, ie, the pole initially has inertia given by equation (ML^2)/12.After the colision, the ball sticks to the pole and the two rotate together. What is needed to be found is the angular speed...
thanks for the replies. No, the car is not accelerating in the verticle direction, so i can see why the forces in the verticle must equal zero. I have been looking at a link at the bottom of the page to a question posted on here over a year ago which was asking the same question i am.
Homework Statement
this example is in the txtbook so i know the answer, but i don't really get the second part.
The road needs to be at a banked angle so the car traveling at 13.4m/s can go around with no friction needed, the radius of the corner is 35m.
Homework Equations
the...
Hi, thanks for that. But the question is asking what is the difference in the time of exposure. do you know what is being referred to as light energy?
-- well i just found out the answer is four, but I am not sure how to get that?
Homework Statement
using the same film and level of illumination two pictures are taken, one with double the f number of the other. for both films to receive the same total light energy, what factor must the required time of exposure change for the picture with double the f number...
Thanks. Yes i know the defnintion of the Ci, it is 3.7x10^10 Bq.
with the half life, i calculatd the decay contant.
with know time, activity and decay constant, i can calculate the initial amount, No.
With the initial amount No and the decay constant, i can find the initial activity...
Homework Statement
60Co, half life = 5.2 years, decays by emittion of a beta particle (0.31 MeV) and two gamma particles (1.71MeV and 1.33MeV). what is the minimum initial mass needed of 60Co that will have an activity of at least 10Ci after 30 months?
Homework Equations
half life =...
ok, so if the sled and penguin are pulled with a force equal to the frictional force of the sled and penguin on the ice, the whole sled moves at a constant velocity, as forces are balanced, there is no net force, and so the penguin has no frictional force acting on it.
but then if the...
Homework Statement
i can't fully understand this concept. is this correct?
standing on the Earth's surface i have two forces acting on me. the force due to the fact that i have mass, and so does the earth. given by equation f = (Gm1m2)/r (this force would be acting if the Earth was not...
a change in angle changes the ratio of the vertical to horizontal velocity components of the arrow.
mathematically, for the targets to meet over a range of vector velocities, each of these component velocities, these two variables, must keep a certain relationship to the single variable, the...
you need to find the time it takes for the ball to reach the top of the net.
this is the same time as if it were to fall from 2.4m height, straight down to 0.9m