Which of the following readings cannot be determined with a meter rule?
2.56cm
2.25cm
2.50cm
2.05cm
Correct answer is A
Meter rule has a reading accuracy of 0.5mm or 0.05cm, thus measurement is M ± 0.05cm i.e 2.00, 2.05, 2.50, 2.55 etc.
The reading that cannot be read is 2.56cm.
an increase in the kinetic energy of the body
an increase in the potential energy of the body
a decrease in the kinetic energy of the body
an increase in the height of the body
Correct answer is B
Stable equilibrium brings about increase in potential energy as the height rises after displacement.
164N
160N
158N
172N
Correct answer is C
ω = 2πF = 2π × 2 = 4πrad\(^{-1}\)
Centripetal force = mrω\(^2\)
⇒ 0.5 × 2 × (4π)\(^2\)
⇒ 157.75N
Approximately = 158N.
A cone is in unstable equilibrium, has its potential energy
decreased
increased
unchanged
oscillating
Correct answer is B
In unstable equilibrium, potential energy decreases as the height decreases
380mmHg
570mmHg
190mmHg
480mmHg
Correct answer is B
ρ\(_m\)h\(_m\) = ρ\(_a\)h\(_a\)
13.6(760 - p) × 10\(^{-3}\) = 13 × 10\(^{-5}\)(20 × 10\(^3\))