Recent content by andytuki

Yeah, i got the same answer. 360.76N, hopefully they accept that.

Fcos(27.5) - 357.7sin(27.5) - 0.32(357.7cos(27.5)) -0.32Fsin27.5 =0 Something like that, check the sin/cos stuff.

Opps, forgot that she applies a horizontal force that creates an additional force between the block and the ramp surface. The normal force is larger, and so the frictional force is larger.

Fcos(27.5) - 357.7sin(27.5) - 0.86(357.7cos(27.5)) = 0 That looks good, except that you should use the coefficient for kinetic. Don't use static at all in that equation. Because the block is already moving, and it is only feeling kinetic friction. If the question asked...what is the minimum...

Constant speed up the ramp. Fnet= zero So she applies a horizontal force to push the book up at constant velocity. Some of this horizontal force is used to push the books in the direction of the ramp. Since the object is moving, you use kinetic friction coefficient. There is frictional force...

The ball does have to move at that speed upwards, but the ball left the racket 3 degrees above the horizontal. The speed of the ball was a lot faster than 2.54 ms. How is speed in the Y direction related to the overall speed.

So we start off with two different forces in opposing direction and we have to compare them. There can be an equilibrium of forces with a net force of zero but with constant velocity. (Diagram 5 and 8) And there can be static equilibrium where the net force is zero and the box is not moving...

Yeah, but I think your calculations may be wrong if you got 3.63E-3 N for the total pull from the moon and sun. Did you use meters for distance and kg for the mass?

Use energies. It starts out with energy that carries it down the roof and stops at the bottom with zero final energy. There was work down on it to change the energy, frictional work. W = Delta KE

Do a Force FBD. Tension is the only force holding up the Box. The Weight force is pushing the box down. When these two forces are equal the net force is zero and it is the minimum force to raise the crate. (force can be zero, but still have constant velocity to raise the box) Weight for up is...

Lets set some coordinates. Position of Tina is zero. She will travel X distance when she catches up with David. David travels to position X too when Tina reaches him. Two equations that have the same distances and the same time (time it takes to reach position X). Tina (Using our coord. the...

Wikipedia of Newton's 3rd Law: Whenever a first body exerts a force F on a second body, the second body exerts a force −F on the first body. F and −F are equal in magnitude and opposite in direction. The downward force of the book is F(weight) + F(applied by hand). Book acting on table. Now...

Total eclipse is the moon's shadow onto Earth. Sun -------> moon (((((( Earth The Gravitational pull from the sun and moon will be in the opposite direction than Earth. Force total = F(earth) - F(moon) - F(sun)

The sign of the reflected wave (up or down) depends on the mediums that it travels from & to. A wave with a positive amplitude that is traveling from a medium with light density (air) to a heavier density medium (water) will reflect with a negative amplitude. This action is analogous to a...