Work is defined as the a. (c) mass times acceleration b. (b) force times acceler

Question

Work is defined as the a. (c) mass times acceleration b. (b) force times acceleration c. (a) mass times velocity d. (d) mass times velocity times distance e. (e) none Doppler's effect arises due to a. the motion of observer toward the source and the motion of the source toward the observer b. the stationary nature of the source c. (c) the stationary nature of the observer d. (d) all of (a), (b), and (c) e. (e) none If the distance between two gravitating objects doubles, the resulting force of attraction a. (e) none b. drops to one-fourth c. becomes four-fold d. (d) drops to one-half e. becomes two-fold Pressure is defined as the a. torque per unit area b. work per unit area c. momentum per unit area d. none e. energy per unit area Power is defined as a. doing some work b. grabbing something by force c. showing one's muscle d. none e. units of utility bills charged for Angular velocity is measured in angle generated in a 1. none b 2. steradian s per second c 3. radian s per second d 4. meter per second e 5. degree per second An object is in equilibrium if the a. vector sum of the forces acting on it is zero and the vector sum of torques acting on it is zero b. sum of angular momentum acting on it is zero c. sum of linear momentum is zero d. all of (a), (b), and (c) e. none Normal force acts a. 1. at the interface of two objects and perpendicular to the interface of two objects b. perpendicular to a plane c. tangential to a plane d. (d) all of (a), (b), and (c) e. none

Explanation / Answer

(1)

option (e) is correct answer because W = F d

(2)

option (d) is correct answer

(3)

F = 1/r^2

F' = 1/ r'^2

when r' = 2r

F'/F = ( r/r')^2

= F( r/2r)^2

F' = F/4

option (b) is correct answer

(4)

option (d) is correct answer because P = force per unit area

(5)

option (d) is correct answer

(6)

option (3) is correct answer

(7)

option (d) is correct answr

(8)

option (a) is correct answer

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