1 point

What type of wave is shown below?

Elena-2011 [213]

Answer:

B. Transverse wave.

Explanation:

Because it has troughs and crests.

5 0

3 years ago

A simple model of the hydrogen atom suggests that the electron orbits the proton. What is the

andrey2020 [161]

If I remember correctly, the correct answer is either:
A. Electrostatic
or
B. Gravitational

7 0

3 years ago

Given a constant acceleration and assuming linear motion, derive equations for velocity and position of a body with respect to t

uysha [10]

Answer:

v = at + u

$x = ut+\frac{1}{2}at^{2}+x_{0}$

Explanation:

acceleration, a = constant

As we know that acceleration is the rate of change of velocity

$a=\frac{dv}{dt}$

$dv=adt$

integrate on both sides

$\int dv=\int adt$

v = at + u

Where, u is the integrating constant and here it is equal to the initial velocity

Now we know that the rate of change of displacement is called velocity

$v = \frac{dx}{dt}$

$dx=vdt=(u+at) dt$

Integrate on both sides

$\int dx=\int (u+at) dt$

$x = ut+\frac{1}{2}at^{2}+x_{0}$

where, xo is the integrating constant which is initial position of the particle.

8 0

3 years ago

A person is lifting a heavy box using a lever. What is the purpose of the lever in this situation?

ruslelena [56]

Answer:

to reduce the force needed to lift the box and change the direction of the force

Explanation:

1. "A lever consists of a rigid bar that is able to pivot at one point. This point of rotation is known as the fulcrum. A force is applied at some point away from the fulcrum (typically called the effort)."

By this definition, we know that force is needed to lift an object using a lever.

2. "When the input and output forces are on opposite sides of the fulcrum, the lever changes the direction of the applied force. This occurs only with first-class levers. When both the input and output forces are on the same side of the fulcrum, the direction of the applied force does not change"

For example, on a sew saw, if a force is applied on one end, you on the other side/end would go up, meaning a change in direction.

3. Lastly, we know a lever is typically used to reduce work, in other words, the force needed to move something.

Basically, if we were to put a lever into an equation:

reduced force + change in direction = lever

(the expection) unless load and force are on the same side, there will be no change in direction.

For example, if you and your friend sit on the same side of a sew saw, the sew saw would not go up or down, meaning no change in direction.

So if not stated otherwise you can assume the load and force are on opposite sides. The purpose of a lever in that situation would be to reduce the force needed to lift the box and change the direction of the force.

*While reading my explanation, it may be helpful to look up a diagram containing a lever, with a load, fulcrum, and applied force.

6 0

2 years ago

Can you answer the b. thanks

levacccp [35]

Answer:

current going into a junction in a circuit is EQUAL TO the current comming out of the junction.

Explanation:

Krichhoff's Current Law

Kirchhoff's current law (1st Law) states that current flowing into a node (or a junction) must be equal to current flowing out of it.

4 0

2 years ago