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3 years ago

Physical Science E2020 Unit Test

Physics

2 answers:

mart [117]3 years ago

8 0

Answer:The correct answer is option B.

Explanation:

Work done is defined product of force applied on an object and the displacement of an object on applying of force.It is measured in Joules.

$W=Force\times Displacement$

1. Chet

Work done = $50 N\times 1.0 m= 50.0 Joules$

2. Mika

Work done = $40 N\times 2.0 m= 80.0 Joules$

3. Sara

Work done = $30 N\times 1.5 m= 45.0 Joules$

4.Bill

Work done = $60 N\times 0.5 m= 30.0 Joules$

The greatest work was done by Mika and least work was done by BIll. The order from the greatest amount of work done to the least.

Mika>Chet>Sara>Bill.

Hence ,the correct answer is option B.

vladimir2022 [97]3 years ago

5 0

i think its b

hope this helps

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Read 2 more answers

An autotransformer is used to reduce the voltage of a 100-kilovolt amp, 480-volt secondary of an isolated type transformer, to s

tigry1 [53]

Answer:

42KVA

Explanation:

Given data

High Voltage (HV)= 480V

Low Voltage (LV)= 277V

Fo find

Size of transformer=?

Solution

To find the size of transformer here we use the co-ratio.The Co-ratio is given as:

Co-Ratio= (HV - LV)/HV

where

HV is High Voltage

LV is Low Voltage

Now put the values we get

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3 years ago

A flat coil of wire consisting of 15 turns, each with an area of 40 cm 2, is positioned perpendicularly to a uniform magnetic fi

zheka24 [161]

Answer:

0.54 A

Explanation:

Parameters given:

Number of turns, N = 15

Area of coil, A = 40 cm² = 0.004 m²

Change in magnetic field, ΔB = 5.1 - 1.5 = 3.6 T

Time interval, Δt = 2 secs

Resistance of the coil, R = 0.2 ohms

To get the magnitude of the current, we have to first find the magnitude of the EMF induced in the coil:

|V| = |(-N * ΔB * A) /Δt)

|V| = | (-15 * 3.6 * 0.004) / 2 |

|V| = 0.108 V

According to Ohm's law:

|V| = |I| * R

|I| = |V| / R

|I| = 0.108 / 0.2

|I| = 0.54 A

The magnitude of the current in the coil of wire is 0.54 A

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3 years ago

*Physical Science* *E2020* *Unit Test*

Physical Science E2020 Unit Test