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3 years ago

4. Someone took the last cookie in the cookie jar last night. The LAST

Physics

1 answer:

tangare [24]3 years ago

3 0

Answer:

I think B is the answer

Explanation:

I think this cause a maid always cleans the house and might be awake at night

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How to determine my slope in physics graph

Hatshy [7]

Answer:

Determine the coordinates of two points on the line. Calculate the difference between these two locations' y-coordinates (rise). Calculate the x-coordinate difference between these two places (run). Divide the y-coordinate difference by the x-coordinate difference (rise/run or slope).

5 0

2 years ago

Build a second circuit with a battery and a light bulb but this time add a switch. Your circuit might look something like the on

kompoz [17]

Answer:

the resistance of the wire has no effect on the brightness of the bulb.

Explanation:

Let's apply ohm's law for your light bulb circuit plus wires plus switch

V = I R_{bulb} + I R_ {wire}

the current in a series circuit is constant

V = I (R_{bulb} + R_{wire})

To know the effect of the wires on the brightness of the bulb, we must look for the value of the typical resistance of these elements.

Incandescent bulb

Power 60 W

let's use the power ratio

P = V I = V2 / R

R = V2 / P

the voltage value for this power is V = 120 V

R = 120 2/60

R_bulb = 240 Ω

Resistance of a 14 gauge copper wire (most used), we look for it on the internet

R = 8.45 Ω/ km

in a laboratory circuit approximately 2 m is used, so the resistance of our cable is

R = 8.45 10⁻³ 2

R_wire = 0.0169 Ω

let's buy the two resistors

R_{bulb} = 240

R_{wire} = 0.0169

$\frac{R_{bulb} }{R_{wire} } = \frac{240 }{ 0.0169}$

$\frac{ R_{bulb} }{ R_{wire} } = 1.4 \ 10^4$

therefore resistance of the bulb is much greater than that of the wire, therefore almost all the power is dissipated in the bulb.

In summary, the resistance of the wire has no effect on the brightness of the bulb.

6 0

3 years ago

(15 points)

vodomira [7]

Answer:

1. Decrease

2. Decrease

3. Stay the same

Explanation:

1. The more predators there are that eat the prey(cricket/frog), the less prey there will be.

2. The more the pollution effects them negatively, the more the population will die off.

3. The decrease of food may kill the population, but the increase of food does not effect the birth rate of the population.

4 0

3 years ago

A box of mass 26 kg is initially at rest on a flat floor. The coefficient of kinetic friction between the box and the floor is 0

Kazeer [188]

Answer:

$\Delta K = 52J$

Explanation:

The change in kinetic energy will be simply the difference between the final and initial kinetic energies: $\Delta K=K_f-K_i$

We know that the formula for the kinetic energy for an object is:

$K=\frac{mv^2}{2}$

where m is the mass of the object and v its velocity.

For our case then we have:

$\Delta K = K_f-K_i=\frac{mv_f^2}{2}-\frac{mv_i^2}{2}=\frac{m(v_f^2-v_i^2)}{2}$

Which for our values is:

$\Delta K = \frac{m(v_f^2-v_i^2)}{2} = \frac{(26Kg)((2m/s)^2-(0m/s)^2)}{2} = 52J$

3 0

4 years ago

(01.06 LC)

Marta_Voda [28]

Answer:

Equilibrium is reached when demand equals supply.

Explanation:

Demand is the amount that consumers want and can buy of a certain product or service in a specific period of time and at a certain price. On the other hand, the supply is the amount that producers want and can sell of a certain product or service in a specific period of time and at a certain price.

In market equilibrium, the quantity demanded of the product or service equals the quantity supplied, so the price also equals. In other words, when market equilibrium is reached, demand and supply are the same, with their corresponding equilibrium price and quantity.

Two situations can occur:

When the quantity demanded is greater than the quantity supplied, the market is in a situation of excess demand.

On the other hand, it may happen that the price at which the products are being offered is greater than the equilibrium price and the quantity supplied is greater than the quantity demanded. Then there is an excess supply.

Equilibrium is reached when demand equals supply.

4 0

4 years ago