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Questions in physics

[Answered] A fan turns at a rate of 1200 rev per minute. Calculate: a) Angular speed at a point on one of the fan blades. b) Tangential speed at the tip of the blade. c) If the distance from the center to the tip is 102 cm

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Select the correct answer. Which statement is true according to Newton's second law of motion? A. An object accelerates in the direction opposite to the direction of the force applied. B. An object accelerates in the direction perpendicular to the direction of the force applied. C. An object accelerates in the same direction as that of the force applied. D. An object undergoes no acceleration on the application of force. E. An object's acceleration is independent to the force applied.

[Answered] What is the momentum of a 5 kg object that has a velocity of $1.2 m / s$? A. $3.8 kg \cdot m / s$ B. $4.2 kg \cdot m / s$ C. $6.0 kg \cdot m / s$

[Answered] What is energy gap? (a) The energy band in which electrons can move freely. (b) An energy level at which an electron can exist (c) The space between two orbital shells (d) The energy equal to the energy acquired by an electron passing 1 V electric field

[Answered] 2.1 How does the nature of a surface on which an object is being moved affect the frictional force experienced by the object? 2.2 State the two factors on which friction depends.

[Answered] What is the relationship between temperature and kinetic energy? A. When all molecular motion stops, the temperature starts to decrease. B. As molecules move more quickly, the temperature increases. C. When all molecular motion stops, the temperature stops changing. D. As molecules slow down, the temperature starts to increase.

[Answered] A soccer ball is traveling at a velocity of [tex]$50 m / s$[/tex]. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? A. 0.1 kg B. 0.4 kg C. 5 kg

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] The loudest sound measured one night during a hockey game was 112 dB. The loudest sound measured during a hockey game the next night was 118 dB. What fraction of sound intensity of the second game was the sound intensity of the first game? [tex]L=10 \log \left(\frac{1}{f_0}\right)[/tex] [tex]L=[/tex] loudness, in decibels [tex]I=[/tex] sound intensity, in watts / [tex]m^2[/tex] [tex]I_0=10^{-12} watts / m^2[/tex] A. 0.25 B. 0.78 C. 0.95 D. 0.99