Andrew Said:

please help answer these physics homework problems for me.?

We Answered:

Friction = Coefficient of friction X mass
Normal force is opposing to the decomposed force always =
mass X gravity X cos of the angle
Gravity = 9.8(you can use 10)

Net force will be the other decomposed force - friction
the other decomposed force which makes the mass slide down is
mass X gravity X sen of the angle of the inclined plain

Net force = (m X g X sen of the angle) - m X coefficient of friction

Acceleration
Force = mass X acceleration
therefore Acceleraion = net force/mass

Louise Said:

need help with some physics homework problems?

We Answered:

Here's the magic equation! mgh = E. Don't forget it no matter what because it is what makes your life insanely nice!
So your first answer E = 1000 X 9.80 X 2 =19600

For the second one find mgh at 10 m and at 5 then subtract.
Correspondingly it equals (50 X 9.80 X 10) - (50 X 9.80 X 5)=2450

Marlene Said:

A couple of physics homework problems?

We Answered:

1)

Whenever you are dealing with relative velocities. We are dealing with a vector sum or vector difference. You simply take all the vectors being considered and either add or subtract each accordingly. In this situation, a plane is heading north with a velocity of 120 km/h. Therefore the vector associated with this plane has a direction pointing north. The magnitude of this vector is 120 km/h. A tailwind is a wind blowing to help increase speed, which means it is also blowing north. So the tailwind has a direction north and magnitude 30 km/h. Since both vectors are heading in the same direction, simply add them.

v(relative) = v(plane) + v(tailwind) = 120 + 30 = 150 km/h

2)

This problem is dealing with basic trigonometry. We are given a velocity vector that points at 35 degrees above the horizontal or ground with magnitude 15 m/s. We want to find the velocity in the x-direction, so split the velocity vector into its x and y components.

a. v(x-component) = v cos(Ɵ)

v(x) = 15 cos(35°) = 12.29 m/s

b. recall that velocity is the change of distance over change in time:

v = d / t

or

d = (v)(t)

d(x-direction) = v(x-direction)(time)

d = (12.29)(2) = 24.57 m

Note: All of these concepts are not difficult to understand. It is essential in physics you understand the concept at work before you do any problems. These problems represent some of the more basic math concepts. It would be a good idea to get a good review of some math skills as well. Good luck.

Jordan Said:

help help with physics homework problems?

We Answered:

Since the stone did not gain any potential energy, the energy is stored in the slingshot bands
=F*d
=30*.2
=6

Assume all of the energy gets transferred to the stone's kinetic energy in 20 cm

1/2 *m*v^2
set equal to potential and solve for v

=15.5 m/s

j

Brett Said:

physics homework?

We Answered:

If you are saying the the resistance (???) is .335 watts/km then the power loss is 163*.335 watts or 65.6 watts for the 163 km.

Marvin Said:

Physics Homework Problems?

We Answered:

for the first one its the square root(57(9.8)/tan(3)). i had the same problem which is about 103.24