You hold a thumbtack between your index finger and thumb with a force of 10 n. the needle has an area of 1 x 10-7 m2 whereas the flat end has an area of 3 x 10-4 m2.
what is the force experienced by our finger; what is the force experienced by your thumb.
your thumb holds the pointy end. what is the pressure on the thumb; what is the pressure on your finger?
a 16.48 g sample of an unknown metal, heated to 99.0 °c was then plunged into 50.0 ml of 25.0 °c water. the temperature of the water rose to 28.1 °c. assuming no loss of energy to the surroundings:
how many joules of energy did the water absorb?
b. how many joules of energy did the metal lose?
c. what is the specific heat of the metal?

Part f - example: finding two forces (part i) two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. the block in (figure 1) has a mass m=10kg and is being pulled by a force f on a table with coefficient of static friction îľs=0.3. four forces act on it: the applied force f (directed î¸=30â above the horizontal). the force of gravity fg=mg (directly down, where g=9.8m/s2). the normal force n (directly up). the force of static friction fs (directly left, opposing any potential motion). if we want to find the size of the force necessary to just barely overcome static friction (in which case fs=îľsn), we use the condition that the sum of the forces in both directions must be 0. using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: fcosî¸â’îľsn=0 fsinî¸+nâ’mg=0 in order to find the magnitude of force f, we have to solve a system of two equations with both f and the normal force n unknown. use the methods we have learned to find an expression for f in terms of m, g, î¸, and îľs (no n).

What about a rubber band, can it change its shape? is it a solid?

Which statements best describe energy? check all that apply. the total amount of energy in the universe remains constant. the total amount of energy in the universe changes constantly. energy cannot be converted from one form to another. energy can be converted from one form to another. energy cannot be created or destroyed. energy can be created or destroyed.