Need Help With Physics Hw

Need Help with Physics HW?

The string between blocks B and C must accelerate blocks A and B but NOT C
So EACH block is getting a force of 1.50 N

You could work out the acceleration but it isn't necessary. A simple ratio is all that is needed.
( a = F/m = 3.00 / ( 2 * 0.400 ) )

The string between A and B only accelerates a single block so it needs LESS force. The tension needed is ........
The force F accelerates a total of THREE blocks. Which requires a TOTAL force of .........

Need help with Physics homework.?

What is the ratio of the gravitational force on you when you are 5400 km above the Earth's surface versus when you are standing on the surface? (The Earth's radius is about 6400 km.)

I need help with my physics homework?

Hor

s = 37 (I shall assume metres)
u = Vcos44
t = T

s = ut gives 37 = (Vcos44)T so T = 37/Vcos44

Vert (Upwards is +ve)

s = -0.75m
u = Vsin44
v = ?
a = -g = -9.81ms^-2
t = T = 37/Vcos44

s = ut + (1/2)at^2 gives

-0.75 = Vsin44(37/Vcos44) - (9.81/2)(37/Vcos44)^2

-0.75 = 37tan 44 - (9.81/2)(37)^2/(Vcos44)^2

-0.75 = 35.73 - 12 977.00/V^2

36.48 = 12 977.00/V^2

V ~ 18.86 m/s

You are better off remembering y = xtanA - gx^2 (secA)^2/2V^2 where A is the angle, etc

Need help with physics homework?

calculate the critical angle using the indices of refraction of air and water via Snell's law, then use the 65m depth and this angle to calculate the (horizontal) distance...

http://www.glenbrook.k12.il.us/gbssci/ph...

cheers

Need help on physics homework!?

How much tension must a rope withstand if it is used to accelerate a 1000 kg car vertically upward at 0.90 m/s2?

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.79 of the person's regular weight. Calculate the acceleration of the elevator, and find the direction of acceleration.

Please help if you can.

Need help with Physics homework.?

What is the Earth's gravitational force on you when you are standing on the Earth and when you are riding in the Space Shuttle 460 km above the Earth's surface? Answer as a fraction of the surface gravity of Earth. (The Earth's radius is 6400 km.)

Physics Homework. NEED HELP!!?

M1 is pulling down on the rope (and up on the objects on the floor with a force of
F1 = ma = 22.2*9.8=217.56 N

Just sitting on the floor, M2 and M3 would have a resting force of
F2,3 = ma = (33.5+176)*9.8 = 2053.1 N

BUT... M1 is effectively pulling up on M2 and M3 with a Force of 217.56 N

Therefore, M2 and M3 are sitting on the floor with a force of
Resultant Force = F2,3 - F1 = 2053.1-217.6 = 1835.5 N (the floor pushes back with an equal and opposite force.)

Need Help On Physics Homework?

Find the density of seawater at a depth where
the pressure is 2300 atm if the density at the
surface is 1100 kg/m3
. Seawater has a bulk
modulus of 2.3 × 109 N/m
2
.
Answer in units of kg/m3
.

Help with physics hw asap please?

I'm a maths person not a physicist, but isn't this a case of:

speed = frequency x wavelength

speed = 413÷9 = 45·89 cm/s
frequency = 42·7÷31·3 = 1·364 Hz

wavelength = speed / frequency
= 45·89 ÷ 1·364
= 33·6 cm to the nearest 0·1 cm.