The momentum of a car moving at a constant speed in a circular track
can be both positive and negative
can be zero depending on its position in the track
can be zero depending on its inertia in the track
a centrifugal
Correct answer is C
Movement of an object in a circle with an acceleration towards its center is provided by change in velocity & centripetal force a α V α Fc
366j
240j
144j
90j
Correct answer is C
F = 6N, m = 2kg, t = 4s, u = 0 (stationary or at rest)
| K.E | = | 1
2 |
mv\(^2\) |
| F | = | mv
t |
from rest
| K.E | = | 1
2 |
m( | Ft
m |
)\(^2\) | = | 1
2 |
× | 2 x (\(\frac{6 \times 4}{2})^2 = 12^2 = 144J\) |
According to kinetic molecular model, in gases
The particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern
The particles occur in clusters with molecules slightly farther apart
The molecule are very fast apart & occupy all the space made available
The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them
Correct answer is C
In kinetic molecular model, gases are energized and thus moves freely, fast as they occupy specific space
Diaphragm, Aperture, film
Aperture, Diaphragm, Film
Film, Diaphragm, Aperture
Film, Aperture, Diaphragm
Correct answer is D
- retina is similar to film
- pupil is similar to aperture
- iris is similar to diaphragm
6.7N/kg
7.9N/kg
8.0N/kg
9.8N/kg
Correct answer is D
| E | = | F
m |
= | GMm/d\(^2\)
m |
= | GM
d\(^2\) |
| E | = | 6.7 × 10\(^{-11}\) × 6 × 10\(^{24}\)
(6.4 × 10\(^6\))\(^2\) |
= | 9.8N
kg |
E = g = 9.8N/kg