What is the current in a 160V circuit if the resistance is 2Ω? V= I= R=

1. seesaw

Sergeeva-Olga [200]

Answer:

1 seesaw = first class lever

2. pencil and sharpener = wheel and axle

3. bottle opener = second class lever

4. forearm = third class lever

5. nail = wedge

Explanation:

The given objects are classic examples of simple machines.

Lever: There are 3 types of levers and they depend on where the load, applied force, and fulcrum are.

First class levers have the fulcrum in between the load and the applied force. In other words, the load and applied force are at opposite ends. The seesaw is a good example of this. Other examples would be, pliers, scissors, and the like.

Second class levers have the fulcrum and the applied force at the opposite ends. So in this case, the load is found in between. Examples of this would be a bottle opener or a crowbar.

For third class levers, the load and the fulcrum are at opposite ends and the applied force is in between. The forearm is a good example, so is a stapler, or even a broom.

A wedge is another simple machine. It is thick at one end and it gets thinner towards the other end, or it usually has a sharp end. Other examples of this would be an axe, or a knife.

A sharpener is actually a compound machine. The old-fashioned type of pencil sharpener, the one you crank makes use of a wheel and axle and a wedge. A wheel and axle is usually a machine that makes use of two circular parts; a wheel and a rod that is attached to its center.

4 0

3 years ago

Chapter 38, Problem 001

Norma-Jean [14]

Answer:

a) $\lambda=2.95x10^{-6}m$

b) infrared region

Explanation:

Photon energy is the "energy carried by a single photon. This amount of energy is directly proportional to the photon's electromagnetic frequency and is inversely proportional to the wavelength. If we have higher the photon's frequency then we have higher its energy. Equivalently, with longer the photon's wavelength, we have lower energy".

Part a

Is provide that the smallest amount of energy that is needed to dissociate a molecule of a material on this case 0.42eV. We know that the energy of the photon is equal to:

$E=hf$

Where h is the Planck's Constant. By the other hand the know that $c=f\lambda$ and if we solve for f we have:

$f=\frac{c}{\lambda}$

If we replace the last equation into the E formula we got:

$E=h\frac{c}{\lambda}$

And if we solve for $\lambda$ we got:

$\lambda =\frac{hc}{E}$

Using the value of the constant $h=4.136x10^{-15} eVs$ we have this:

$\lambda=\frac{4.136x10^{15}eVs (3x10^8 \frac{m}{s})}{0.42eV}=2.95x10^{-6}m$

$\lambda=2.95x10^{-6}m$

Part b

If we see the figure attached, with the red arrow, the value for the wavelenght obtained from part a) is on the infrared region, since is in the order of $10^{-6}m$

4 0

2 years ago

Force of impact is the force ________________. A. of velocity B. of acceleration C. generated when objects meet D. of momentum

expeople1 [14]

I think it is B, because acceleration is the speed with force?

7 0

3 years ago

Read 2 more answers

Two point charges, +3.21 µC and -6.75 µC, are separated by 1.13 m. What is the electric potential midway between them?

dlinn [17]

Answer: The electric potential midway between them is -5.64 × 10^4 V

Explanation:

Electric potential is measured in volts or joules per coulomb. It is the amount of work required to move a charge from a reference point to a specific point inside the field.

Electric potential V = Σkq/r

k = coulomb's constant = 9.0x10^9 N-m^2/C^2

q1 = +3.21 × 10^-6 C

q2 = -6.75 × 10^-6 C

r = 1.13/2 = 0.565m

V = kq1/r + kq2/r = (k/r)(q1 + q2)

Substituting the values;

V = (9.0x10^9/0.565)(3.21 - 6.75) × 10^-6

V = -56389.3805309 Volt

V = -5.64 × 10^4 volts

4 0

3 years ago

Helpppppppppppppppp its timeddddddddddd

leva [86]

Answer:

The answer is the third option.

Explanation:

The electrostatic force, Coulomb's force, is a force that depends on the inverse of the square distance, it is a non-contact force.

On the other hand, stretched spring is a contact force, it needs a contact external force.

Therefore, the answer is the third option.

I hope it helps you!

4 0

2 years ago