# Natural science : Physics Paper Homework Help

⦁ The number of electron-taken out from a body to produce 1 coulomb of charge will be :

⦁ An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :

4)

5)

6)

7)

8)

⦁ – 1.6 µC charge can be generated on a body by :

⦁ A unit Coulomb charge is one which when placed in air at a distance of 1 m from an equal and similar charge repel it with a force of

⦁ Two point charges each of 20 µC are placed 50 cm apart in air. What is the electric field intensity at the mid point on the line joining the centre of two point charges?

Section 2

⦁ A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s2. How far does it travel while accelerating?

⦁ A car travels 95 km to the north at 70.0 km/h, then turns around and travels 21.9 km at

80.0 km/h. What is the difference between the average speed and the average velocity on this trip?

⦁ Acceleration is sometimes expressed in multiples of g, where g = 9.8 m/s2 is the acceleration due to the earth’s gravity. In a car crash, the car’s velocity may go from 26 m/s to 0 m/s in 0.15 s. How many g’s are experienced, on average, by the driver?

⦁ A train starts from rest and accelerates uniformly, until it has traveled 5.6 km and acquired a velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to:

⦁ A ball is thrown straight upward with a velocity of 39 m/s. How much time passes before the ball strikes the ground? (Disregard air resistance.)

⦁ A package is dropped from a helicopter moving upward at 15 m/s. If it takes 16.0 s before the package strikes the ground, how high above the ground was the package when it was released? (Disregard air resistance.)

⦁ A railroad train travels forward along a straight track at 80.0 m/s for 1 000 m and then travels at 50.0 m/s for the next 1 000 m. What is the average velocity?

⦁ European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.)

Section 3

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⦁ The number of electron-taken out from a body to produce 1 coulomb of charge will be :

⦁ An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :

4)

5)

6)

7)

8)

⦁ – 1.6 µC charge can be generated on a body by :

⦁ A unit Coulomb charge is one which when placed in air at a distance of 1 m from an equal and similar charge repel it with a force of

⦁ Two point charges each of 20 µC are placed 50 cm apart in air. What is the electric field intensity at the mid point on the line joining the centre of two point charges?

Section 2

⦁ A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s2. How far does it travel while accelerating?

⦁ A car travels 95 km to the north at 70.0 km/h, then turns around and travels 21.9 km at

80.0 km/h. What is the difference between the average speed and the average velocity on this trip?

⦁ Acceleration is sometimes expressed in multiples of g, where g = 9.8 m/s2 is the acceleration due to the earth’s gravity. In a car crash, the car’s velocity may go from 26 m/s to 0 m/s in 0.15 s. How many g’s are experienced, on average, by the driver?

⦁ A train starts from rest and accelerates uniformly, until it has traveled 5.6 km and acquired a velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to:

⦁ A ball is thrown straight upward with a velocity of 39 m/s. How much time passes before the ball strikes the ground? (Disregard air resistance.)

⦁ A package is dropped from a helicopter moving upward at 15 m/s. If it takes 16.0 s before the package strikes the ground, how high above the ground was the package when it was released? (Disregard air resistance.)

⦁ A railroad train travels forward along a straight track at 80.0 m/s for 1 000 m and then travels at 50.0 m/s for the next 1 000 m. What is the average velocity?

⦁ European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.)

Section 3

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