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2 years ago

Can someone please answer this, ill give you brainliest Would be very appreciated.

Physics

2 answers:

Evgesh-ka [11]2 years ago

3 0

Answer:

False

Explanation:

Solid water (ice) has a lesser density than liquid water. Hence, the statement is false.

Aleks04 [339]2 years ago

3 0

Answer:

False

Explanation:

Let's know the relationship

Density=Mass/Volume

Density is indirectly proportional to volume

If volume is less density is more and if volume is more density is less.

But Density also depends on temperature

Higher the temperature higher the density.

Liquid stage of water has higher temperature than solid .

Liquid has higher density than solid .

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An external force of 5N is applied to a go-kart that is opposite it’s direction of travel for 5 seconds. What is the resulting m

Greeley [361]

Answer:

25N.s=25kgm/s

Explanation:

The resulting momentum in this case is equal to the impulse created by the force 5N during 5 seconds

ΔP=Force.time=F.t

= 5x5=25kgm/s

5 0

3 years ago

A mass of 3.0 kg rests on a smooth surface inclined 34° above the horizontal. It is kept from sliding down the plane by a spring

azamat

Answer:

The spring stretched by x = 13.7 cm

Explanation:

Given data

Mass = 3 kg

k = 120 $\frac{N}{m}$

Angle $\theta$ = 34°

From the free body diagram

Force acting on the box = mg sin $\theta$

⇒ F = 3 × 9.81 × $\sin34$

⇒ F = 16.45 N ------- (1)

Since box is attached with the spring so a spring force also acts on the box.

$F_{sp}$ = k x

$F_{sp}$ = 120 $x$ -------- (2)

The net force acting on the body is given by

$F_{net} = ma$

Since acceleration of the box is zero so

$F_{net} = 0$

$F - F_{sp} = 0$

$F = F_{sp}$

Put the values from equation (1) & (2) we get

16.45 = 120 $x$

x = 0.137 m

x = 13.7 cm

Therefore the spring stretched by x = 13.7 cm

3 0

3 years ago

Explain how your battery works. (You may want to look at the Electric Current lesson) What are some possible materials you could

Lisa [10]

Answer:

A battery is made up of three parts. The Cathode (positive end +) , the Anode (negative end -) and the electrolyte. The electrolyte allows electrical charges to travel between the cathode and anode. This chemical reactions creates the flow of electricity supplying the electrical voltage potential to power a circuit.

Typical materials of a battery are as follows

- Anode most often is made of zinc

- Manganese dioxide acting as Cathode.

- the electrolyte between and inside contains ions

Explanation:

6 0

3 years ago

A wire is joined to points X and Y in the circuit diagram shown.

Yanka [14]

when wire is added short Circuit occurs makes bulb 1 and 2 turn off but keeps bulb 3 and 4 on .

8 0

4 years ago

Read 2 more answers

Which of the following statements are true?

lukranit [14]

Answer:

The following statements are true:

1) A positive charge and a negative charge attract each other.

2) Electric charge is conserved.

3) A neutral object contains no charge.

4) Two negative charges repel each other.

5) Electric charge is quantized.

Explanation:

1) Experimentally, it has been showed that there are two types of charges (arbitrarily defined as positiva and negative), and that there exists a force between them, being attractive between opposite types of charges.

2) The charge is a fundamental property of matter, and like energy, must be always conserved. It can't neither be created nor destroyed.

3) A neutral object contains no net charge, being equal the number of positive and negative charges in it, so they counteract each other, being the net effect null, so it is said that the object is neutral.

4) As stated in (1) , there exists two types of charges, and it had been experimentally found that charges of the same type repel each other, so two negative charges repel each other.

5) Any charge is ultimately a set of electrons and/or protons, so it is always a multiple of the elementary charge carried by one of them, equal to 1.6*10⁻¹⁹ coulombs (unit of electric charge), so we can conclude that the charge is quantized.

8 0

3 years ago