Fuel was consumed at a steady rate of 5.0 x 10-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 10^3ms-1. Determine the thrust on the rocket?
A. 20N B. 80N C. 200N D. 800N Correct Answer: Option C C. 200NA body of mass 5kg moving with a velocity of 10ms-1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity
A. 4.55ms-1 B. 12.00ms-1 C. 30.00ms-1 D. 50.00ms-1 Correct Answer: Option A A. 4.55ms-1Which of the following about an object performing simple harmonic motion is correct? Its acceleration
A. is maximum at the extreme ends B. is constant and directed towards a fixed point C. is zero when it is displayed from the equilibrum position D. varies linearly with the displacement from a fixed point and is directed towards the fixed point Correct Answer: Option...Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg-1 K-1, g = 10m/s²]
A. 0.119°C B. 0.840°C C. 1.190°C D. 8.400°C Correct Answer: Option A A. 0.119°C Explanation mgh = mcθ θ=gh/c=(10×50)/4200 = 0.119°CAn immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5ºC per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]
A. 1100Jkg-1K-1 B. 320Jkg-1K-1 C. 200Jkg-1K-1 D. 176Jkg-1K-1 Correct Answer: Option B Explanation pt = mcθ C = pt/mθ = (400×1)/(0.5×2.5) = 320Jkg-1K-1Products
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