![A piece of substance of specific heat capacity 450Jkg‾¹k¹ falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms‾²]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
When the temperature of a liquid increases; its surface tension?
A. decreases B. increases C. remains constant D. increases then decreases Correct Answer: Option A = decreases Explanation Surface tension decreases by: * Increasing liquid’s temperature * Adding soap to the...
A solid weighs 10.00N in air; 6N when forcefully immersed in water and 7.0N when fully immersed in a liquid X. Calculate the relative density of the liquid X.
A. 5/3 B. 4/3 C. 3/4 D. 7/10 Correct Answer: Option C = 3/4 Explanation R.D = weigh in air – weigh in liquid X/weigh in air – weigh in water = 10−7/10−6 = 3/4
If the stress on a wire is 107Nm‾² and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young’s modulus of the wire is?
A. 5.0 x 10−4 Nm−2 B. 5.0 x 10−5 Nm−2 C. 2.0 x 10−8 Nm−2 D. 2.0 x 109 Nm−2 Correct Answer: Option D = 2.0 x 109 Nm−2 Explanation Young’s modulus = stress/strain strain = e/l=0.05/10=107/0.005 2 x 109Nm−2...
When the breaks in a car are applied; the frictional force on the tyres is?
A. a disadvantage because it is in the direction of the motion of the car B. a disadvantage because it is in the opposite direction of the motion of the car C. an advantage because it is in the direction of the motion of the car D. an advantage because it is in the...
A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?
A. 1.25 x 104W B. 2.50x 104W C. 1.25 x 106W D. 2.50 x 106W Correct Answer: Option B = 2.50x 104W Explanation P = mv2/t = 800×25×25/20 2.5 x 104WProducts
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Download Conference Paper Article PDF - Video Summarization Based Handout Generation from Video Lectures: A Gesture Recognition Framework
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Download Conference on Advanced Computer Theory Article PDF - Real-Time Mono Vision Gesture-Based Virtual Keyboard System
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