Physics explains the very essential of living in our daily lives and helps you think about the world around you and the world beyond. Physics challenges our imagination as simple as when an apple falls from a tree. The apple is accelerated, since its velocity changes from zero as it is hanging on the tree and moves toward the ground. Physics answers are an excellent online study resource for students. It is a profound collection of solved examples and answers for various physics problems and questions. Mastering physics becomes possible with online practice of the problems with our qualified tutors in TutorVista.
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Below mentioned are few of the units covered:
- Motions and Forces
- Conservation of Energy and Momentum
- Heat and Thermodynamics
- Waves
- Electric and Magnetic Phenomena.
The topics are divided into Physics I, II, III and IV based on the complexity of the topics involved. The topics have also been divided on the basis of Grades. Hence students can get Grade specific help along with Homework help. TutorVista allows students to maintain a wide ranging approach to physics and specialize in the subject.
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Solved Examples
Solution:
Retarding force F = 100N or
Force F = -100N,
mass m = 20 kg,
Initial Velocity (u) = 15 m/s,
Final Veloctiy (V) = 0
From Newtons Second Law, F = ma
-100N = 20Kg $\times$ a
Acceleration (a) = $\frac{-100 N}{20 kg}$
= - 5m/s2.
But we also know that a = $\frac{V-U}{t}$
-5 = $\frac{0-15}{t}$
-5t = -15
t = 3s.
Time required to stop the body = 3s.
Solution:
From Newtons second law, F=ma
Initial Velocity (u) = 0,
Final Velocity (V) = 5m/s,
Time (t) = 1 min = 60 s.
$\therefore$ Acceleration = a = $\frac{V-U}{t}$
= $\frac{5-0}{60}$
= $\frac{1}{12}$ m/s2.
Force = ma = 10 $\times$ $\frac{1}{12}$
= $\frac{10}{12}$
= 0.833 N.
Solved Examples
Solution:
From Newtons Second law, F = ma.
Let force acting on the object when the mass is doubled be equal to F1.
i.e., Mass(m1) = 2m
Acceleration produced = a1
F1 = 2m $\times$ a1
given F = F1
$\therefore$ ma = 2 ma1
a = 2a1
Acceleration, a1 = $\frac{a}{2}$.
Thus, acceleration is reduced to half of the given acceleration if mass is doubled.
Solution:
(a)A wave motion is periodic in nature.The particles of the medium do not move from their mean position but execute vibration but only the energy is transmitted from one point to another.
(b) v = $\lambda$ $\times$ f
where V = Velocity,
$\lambda$ = wavelength,
f = frequency.
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