Answer:
Explanation:
When force applied to the end of the rod in perpendicular direction then net torque on the rod is given as
Now another force is applied at mid point of the rod at an angle of 30 degree with the rod
so new value of torque is given as
so we have
Answer:
A car weighing 15 grams
Explanation:
According to the equation that shows the relationship between mass (m), force (F), and acceleration (a) i.e. F = ma, it can be seen that with a constant force, the mass is inversely proportional to the acceleration.
This means that an increase in mass of an object denotes a decrease in acceleration of that object and vice versa. Hence, according to this question, when pushed with the same amount of force, a car with the least mass will move faster. This car is the car weighing 15grams.
<span>flexibility,glass fibers can dissipate energy along the fiber, normal glass</span>
Answer:
Explanation:
Acceleration, 
Where v and u are the final and initial velocities of Alice's car respectively, t is the time taken for Alice's car to attain velocity of 7 m/s.
Substituting 7 m/s for v, 86 m/s for u and 8 s for t then
Therefore, the car decelerates at a rate of 
Answer:
The size of the mirror must be half of the size of your face.
Explanation:
As we know that pocket mirror is a plane mirror, for the plane mirror, distance of a person from the mirror does not affect the image formed by mirror. But the height of the mirror must be half of the height of the person to see the whole face. It is because pocket mirror is between your head and the virtual image formed, to see the virtual image, your face rays must strike the reflecting surface, for that purpose the size of the mirror must be large enough so that your face rays can strike the reflecting surface easily.
