physics

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms−²)

A. 25N B. 90N C. 96N D. 250N E. 960N Correct Answer: Option D - 250N Explanation Efficiency = M.A/V.R…

5 years ago

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms−¹ and rebounds with the same speed. Determine the impulse experienced by the ball?

A. 20.0kg ms−¹ B. 10.0kg ms−¹ C. 5.0kg ms−¹ D. 1.3kg ms−¹ E. 0.0kg ms−¹ Correct Answer: Option A -…

5 years ago

The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body?

A. 50m B. 65m C. 175m D. 225m E. 300m Correct Answer: Option D - 225m Explanation Distance of A…

5 years ago

A loaded test-tube which floats upright in water is carefully and slightly depressed and then released. Which of the following best describes the sub-sequent motion of the test-tube?

A. Circular B. Rotational C. Random D. Oscillatory E. Translational Correct Answer: Option D - Oscillatory

5 years ago

In a nuclear reaction, the mass defect is 2 x 10^−6g. Calculate the energy released given that the velocity of light is 3 x 108ms−¹

A. 9 x 10^7J B. 1.8 x 10^8J C. 1.8 x 10^9J D. 9 x 10^−10J E. 3.6 x 10^11J…

5 years ago

A capacitor of capacitance 25µF is connected to an a.c power source of frequency 200/πHz. Calculate the reactance of the capacitor

A. 0.01Ω B. 0.02Ω C. 50Ω D. 100Ω E. 150Ω Correct Answer: Option D = 100Ω

5 years ago

The current in a series R-L-C circuit attains its maximum value when the?

A. Impedance is greater than the capacitive reactance B. Inductive reactance is equal to the capacitive reactance C. Inductive reactance…

5 years ago

A magnet is being inserted into a coil of wire. On which of the following factors does the induced e.m.f in the coil depend?

I. Number of turns in the coil II. Strength of the coil III. Speed with which magnet is inserted into…

5 years ago

The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image?

A. 100cm³ B. 40cm³ C. 20cm³ D. 10cm³ E. 4cm³ Correct Answer: Option C - 20cm³

5 years ago

Which of the following is not true of the similarities between a camera and the human eye?

A. Both the camera and the human eye have light proof interiors B. Both the camera and the human eye…

5 years ago
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