Revision on physics No. 6

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You will learn

to develope technical and digital competences,
to develope learning skills,
to check knowledge with physics,
to communicate in English.

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Nagranie dostępne na portalu epodreczniki.pl

nagranie abstraktu

Before the test get acquainted with time management during the test:

Eliminating wrong answers.
Substituting data - a reversed method of finding solution.
Estimating data.
Finding the solution and indicating the correct answer.

Ania’s autumn walk with Brutus the dog.

Read the text below and solve tasks 1 - 3.

During her walk with Brutus Anne noticed two gardeners pushing a 100 kg cart up the hill. The height of the hill is 3 m, and the length of the slope is twice as large. The resistance of the cart is 20% of its weight. During the action the cart moves at the speed of 0.5 $\frac{m}{s}$ .

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Exercise 1

The minimal work that the workers will do when pushing a cart up the hill is

4200 J
2200 J
4000 J
5400 J

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Exercise 2

The gardeners pushing the cart uphill worked with power

350 W
200 W
250 W
300 W

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Exercise 3

When the cart was stopped on the top of the hill, the rope broke suddenly and the cart began to slide down the hill. The speed of the cart at the base of the hill has a value of

6 $\frac{m}{s}$
4 $\frac{m}{s}$
5 $\frac{m}{s}$
7 $\frac{m}{s}$

Read the text below and solve tasks 4 - 6.

During her walk around the playground, Ania noticed that someone hang a small but heavy stone on a string that was 1 m long. Ania realised that it could be treated as a mathematical pendulum. And its vibration period is given with the formula $T = 2 π \sqrt{\frac{l}{g}}$ .

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Exercise 4

Within 1 minute such a pendulum will do (choose the answer below) of full swings

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Exercise 5

For such a pendulum to be a second pendulum (T = 1 s), requires shortening by

75 cm
25 cm
50 cm
100 cm

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Exercise 6

If you substitute the stone with a new one, with a 4 times bigger mass, then the period of pendulum oscillation would increase

1 time
2 times
4 times
16 times

Read the text below and solve tasks 7 - 9.

Ania, standing at a distance from the rhythmically marching troop of soldiers, heard a rhythmic, once a second noise of shoes hitting the ground. The speed of sound propagation in the air is 340 $\frac{m}{s}$ .

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Exercise 7

The rhythmical impact of shoes on the ground produces an acoustic wave of length of

340 m
170 m
510 m
680 m

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Exercise 8

Ania knows that the fish swimming in the pond hear the rhythmic strikes of soldiers on the ground very well. But in the water the sound propagates at 1200 $\frac{m}{s}$ . So the sound for fish has a frequency of

1 Hz
2 Hz
3 Hz
4Hz

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Exercise 9

Ania carefully watched the march of the unit and found that the sound of the blow was heard when the soldiers had legs raised high. The distance of the troop from Ania was

170 m
340 m
510 m
680 m

Read the text below and solve tasks 10 - 12.

In the park, where Ania was walking with her dog Brutus, someone organised a festiwal, at the end of which, balloons filled with helium were used. They rose vertically upwards at the speed of 3 $\frac{m}{s}$ . But on that day, there was a fairly strong wind was blowing at the speed of 4 $\frac{m}{s}$ .

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Exercise 10

When the balloon rose to the height of 90 m, at the same time it travelled the distance of

150 m
90 m
120 m
210 m

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Exercise 11

With the reference to the speed of Earth the balloon moved at

5 $\frac{m}{s}$
3 $\frac{m}{s}$
4 $\frac{m}{s}$
7 $\frac{m}{s}$

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Exercise 12

If the speed of wind was 2 $\frac{m}{s}$ , then the balloon would rise at the speed of

3 $\frac{m}{s}$
4 $\frac{m}{s}$
5 $\frac{m}{s}$
7 $\frac{m}{s}$

Read the text below and solve tasks 13 - 15.

It was getting darker and darker and suddenly the 40 lanterns in the park were switched on. Each lamp was fitted with a bulb of the power 460 W, adjusted to the voltage of 230 V.

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Exercise 13

To lit the park up from the city needs the current

80 A
40 A
60 A
100 A

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Exercise 14

If 1 kWh of energy costs 40 gr, we will pay (choose the answer below) for the about 8‑hour‑long operation of the lamps in park

59 PLN
24 PLN
48 PLN
12 PLN

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Exercise 15

If (due to a failure) the voltage supply dropped to 115 V, then the electrical installation would need the power of

4.6 kW
9.2 kW
23 kW
46 kW

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Exercise 16

Language Exercises

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Exercise 17

Indicate which pairs of expressions or words are translated correctly.

acoustic wave - fala akustyczna
wahadło matematyczne - mathematical pendulum
prędkość rozchodzenia się dźwięku - speed of sound propagation
okres drgań - vibration period
moc - frequency
częstotliwość - voltage

zadanie