Question

I know most people here help with math, but could someone help me with physics. I really need the help as its not my best subject. PLEASE!!!

Answer 1

what is the question. I can try

Answer 2

could u help with a few questions? and here it is, In order for the pressure of a liquid contained within a syringe to increase by 18768.0 N/m2 (or 18768.0 Pa), what force must be applied to the piston of the syringe which has a surface area of 12.5 cm2? Give your answer in N.

Answer 3

Easy peasy, Pressure = Force/Area.

Answer 4

do you know that pressure = force/area

Answer 5

ok, I think I missed that lesson (I wasn't skipping, I went to the doctors bc i was sick). Could you stay for a while, in case I have other problems

Answer 6

i got 150144 for the first one

Answer 7

A star of radius 2.4 x 108 m rotates with an angular speed of 3.0 x 10-6 rad/s. If this star collapses to a radius of 21.8 km, find its final angular speed in rad/s. Treat the star as if it were a uniform sphere, and assume that no mass is lost as the star collapses. The moment of inertia of a uniform sphere is I = (2/5)MR2.
Hint: remember conservation of angular momentum.

Answer 8

can someone help with that one?

Answer 9

I remember from my algebra book that angular speed is \[s=\frac{ \theta }{ t } r \]

Answer 10

umm, i have never seen that before

Answer 11

Okay forget it. I can't remember momentum now.

Answer 12

ok, forget that question. what about this one Jason goes scuba diving in Honduras, where the density of the water in the ocean is 1025 kg/m3. Assuming the pressure of the air is 1.0 atm, what is the pressure when Jason is 9.2 m below the surface? Give your answer in units of atm.

Answer 13

\[P=P_{0}-\rho gh \] Know this equation?

Answer 14

Sorry its plus not minus!

Answer 15

nope. but I will use it.

Answer 16

ok, can u help with one more.
Imagine a hollow tube with frictionless sides, with a solid metal cap disk of mass m and surface area A which is free to slide along the axis of the tube (as in the Figure below). A gas is enclosed between the bottom of the tube and the metal cap such that none of the gas can escape. Initially, the gas exerts a pressure P1 = 349.0 Pa on the bottom of the cap such that the cap hangs motionless (i.e the force F1 due to pressure balances with gravity). The cap is then pushed downwards so that the pressure on the bottom of the cap increases to a new value of P2 = 696.0 Pa. Use this information to find the upward acceleration on the cap at the instant when it is released. Give your answer in m/s2 and do not include a sign (it should be positive anyway).

Hint: Do the problem step by step. First draw a free body diagram of the freely floating cap, noting that the force of pressure balances gravity. Then draw the FBD in the second situation with the new pressure, noting that the net force is no longer zero (it is upwards). Use this method combined with force due to pressure F = PA.

Answer 17

The figure?

Answer 18

do u get it?

Answer 19

Yes

Answer 20

could u explain it to me?

Answer 21

please

Answer 22

Okay, I gotta remember

Answer 23

sorry to ask again, but should I just skip it? bc i only have it and the other one I showed u