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3 years ago

True or False A scientific law expalains that something will happen under certain circumstances?

Physics

1 answer:

Tcecarenko [31]3 years ago

7 0

True, scientific law does explain something that will happen under certain circumstances

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Carl measures the temperature of the water at different depths of the lake to see if there is a relationship.

Oksi-84 [34.3K]

Independent variable - Water depth

The independent variable is something that is purposely changed in order to see the effects of change on the dependent variable. So since Carl wants to measure the temperature of water at different depths we will purposely change the depth of the water in order to observe how this would affect the temperature.

Dependent variable - Temperature of the water

The dependent variable is something that is dependent on the independent variable and is assumed to change as the independent variable changes. So we can determine that the temperature of the water is the independent variable as Carl expects it to change with the depth of the water. Another reason we can determine this is the dependent variable is because Carl can change the depth of the water measured but not the temperature of the water depths.

4 0

3 years ago

A crate is being pulled down an incline as shown in the figure. With respect to the crate's direction of motion, which of the fo

Dmitrij [34]

Answer: Fn

Explanation: Because Fn is applying force upward

7 0

3 years ago

According to Newton’s Third Law of Motion, how are action and reaction forces related. Provide a full explanation with an exampl

hammer [34]

For every action, there is an equal and opposite reaction. For example, take a cup on a table. The weight of the cup is the action, and the reason the cup does not sink through the table is because the table exerts an equal reaction force which is opposite to the action of the cup.

Hope this helps!

5 0

3 years ago

A certain refrigerator has a COP of 5.00. When the refrigerator is running, its power input is 500 W. A sample of water of mass

yulyashka [42]

Answer:

t=20s

Explanation:

To solve this problem we must apply the first law of thermodynamics, which indicates that the energy that enters a system is the same that must come out, resulting in the following equation

For this problem we will assume that the water is in a liquid state, since it is a domestic refrigerator

q=m.cp.(T2-T1)

q=heat

m=mass of water =600g=0.6Kg

cp=

specific heat of water=4186J/kgK

T2=temperature in state 2=20°C

T1=temperature in state 1=0°C

solving:

q=(0.6)(4186)(20-0)=50232J

A refrigerator is a device that allows heat to be removed to an enclosure (Qin), by means of the input of an electrical energy (W) and the heat output (Qout), the coefficient of performance COP, allows to know the ratio between the heat removed ( Qin) and the added electrical power (W), the equation for the COP is

$COP=\frac{Qin}{Win}$

To solve this exercise we must know the value of the heat removed to the water (Qin)

solving for Qin

Qin=(COP)(Win)

Qin=(5)(500W)=2500W

finally we remember that the definition of power is the ratio of work over time

w=work

p=power=500w

$P=\frac{W}{t} \\t=\frac{W}{P} \\t=\frac{50232}{2500} \\t=20.09s$

3 0

3 years ago

When a perfume bottle is opened, some liquid changes to gas and the fragrance spreads around the room. Which sentence explains t

shutvik [7]

The molecules of the perfume diffuse through the room at a certain critical concentration and later are detected by our noses.

4 0

3 years ago