Which of the following statement is correct?
A. The kinetic energy of a body during impact remains constant
B. The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact
C. The kinetic energy of a body before impact is less than the kinetic energy of a body after impact
D. The kinetic energy of a body before impact is more than the kinetic energy of a body after impact
Answer: Option D
Solution (By Examveda Team)
During an impact, some of the kinetic energy is lost due to deformation, heat, and sound.As a result, the kinetic energy of a body before impact is typically more than the kinetic energy after the impact.
This loss of energy depends on the coefficient of restitution and the nature of the materials involved in the impact.
This Question Belongs to Mechanical Engineering >> Engineering Mechanics
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Comments (3)
The resultant of two equal forces P making an angle $$\theta ,$$ is given by
A. $$2{\text{P}}\sin \frac{\theta }{2}$$
B. $$2{\text{P}}\cos \frac{\theta }{2}$$
C. $$2{\text{P}}\tan \frac{\theta }{2}$$
D. $$2{\text{P}}\cot \frac{\theta }{2}$$
A. Equal to
B. Less than
C. Greater than
D. None of these
If a number of forces are acting at a point, their resultant is given by
A. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2}$$
B. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2}} $$
C. $${\left( {\sum {\text{V}} } \right)^2} + {\left( {\sum {\text{H}} } \right)^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)$$
D. $$\sqrt {{{\left( {\sum {\text{V}} } \right)}^2} + {{\left( {\sum {\text{H}} } \right)}^2} + 2\left( {\sum {\text{V}} } \right)\left( {\sum {\text{H}} } \right)} $$
A. $${\text{a}} = \frac{\alpha }{{\text{r}}}$$
B. $${\text{a}} = \alpha {\text{r}}$$
C. $${\text{a}} = \frac{{\text{r}}}{\alpha }$$
D. None of these
d) The kinetic energy of a body before impact is more than the kinetic energy of a body after impact. This statement is correct because during impact, some of the kinetic energy of the body is transferred to other objects in the form of heat, sound, and deformation energy. Therefore, the kinetic energy of the body after impact is less than the kinetic energy before impact.
B. The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact
what about law of conservation of energy......