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WorksheetsG11 EASE 2 Review 25/26
Total questions: 90
Worksheet time: 2hrs 13mins
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40.
Question 1
An iron sphere of radius 0.18m has mass 190kg. Calculate the density of iron.
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Question 2
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Question 3
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Question 4
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Question 5
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Question 8
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Question 9
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Question 10
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50.
An iron sphere of radius 0.2 m has mass 170 kg. Estimate the density of iron.
a)
850 kg/m^3
b)
8500 kg/m^3
c)
1000 kg/m^3
d)
3500 kg/m^3
e)
5000 kg/m^3
51.
Calculate the pressure over atmospheric at a point 2 m below the surface of the water in a swimming pool. The density of water is 1000 kg/m^3. Take acceleration of gravity to be 10 m/s^2.
4 lines
52.
A cube of side 0.4 m floats in water with 0.8 m below the surface of the water. The density of water is 1000 kg/m^3. Calculate the pressure due to the water that acts upwards on the bottom surface of the cube. Take acceleration of gravity to be 10 m/s^2.
4 lines
53.
An elastic cord has an original length of 25 cm. When the cord is extended by applying a force at each end, the length of the cord becomes 40 cm for forces of 0.75N. Calculate the force constant of the cord.
a)
2.5 N/m
b)
5 N/m
c)
7.5 N/m
d)
25 N/m
e)
50 N/m
54.
A spring has a spring constant 60 N/m and is extended within the limit of proportionality by 2 cm. Calculate the elastic potential energy stored in the spring.
a)
60 J
b)
120 J
c)
0.006 J
d)
0.012 J
e)
0.024 J
55.
A rubber band has a force constant of 150 N/m. The work done in extending the band is 0.3 J. Calculate the extension of the band.
a)
40 cm
b)
20 cm
c)
10 cm
d)
6 cm
e)
3 cm
56.
A steel wire of diameter 1.0 mm and length 2 m is suspended from a fixed point and a mass of weight 50 N is suspended from its free end. The Young modulus of the material of the wire is 2.5 × 10^11 Pa. Assuming that the limit of proportionality of the wire is not exceeded, calculate the extension of the wire.
4 lines
57.
An elastic band of area of cross-section 2 mm^2 has an original length of 8 cm. When stretched by a force of 0.4 N, its length becomes 8.5 cm. Calculate the Young modulus of the elastic.
4 lines
58.
A cyclist with mass of 50 kg. Its momentum is 1000 kgms-1. What is its velocity?
a)
50 000 kgms-1
b)
20 kgms-1
c)
200 kgms-1
d)
500 kgms-1
59.
An rugby ball of 1 kg moves with 10 ms-1 to the right. It hits a wall and bounces back with the same speed to the left What is the impulse?
a)
20 Ns to right
b)
0 Ns to the right
c)
20 Ns to the left
d)
0 Ns to the left
60.
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
a)
2 m/s
b)
3.4 m/s
c)
4.6 m/s
d)
7.1 m/s
61.
If an object having a mass of 12 kg is acted upon by a force that causes its speed to increase from 5 m/s to 10 m/s, the impulse causing this change in speed is?
a)
1.1 kg m/s
b)
2.4 kg m/s
c)
60 kg m/s
d)
120 kg m/s
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90.
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