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Eshita Rastogi
Subject: Physics
, asked on 24/5/18
an aeroplane is flying with a uniform speed of 100km/h around the circumference of a circle .what will be the change in velocity in (1/4)th of the round? how much in (1/2) round( ans is 140km/hr and 200km/hr)
Answer
1
Nishant Kumar
Subject: Physics
, asked on 23/5/18
A rocket is fired vertically from the ground with a vertical acccerleration of 10m/s.The fuel is finished in 1min and it continues to move up.What is the maximum height reached
Answer
3
Neil Singh
Subject: Physics
, asked on 22/5/18
Please give me the mathematical proof of the three equations of motion.
Answer
1
Dipesh Kumar Karesia
Subject: Physics
, asked on 22/5/18
how to calculate velocity from position-time graph::: we have to calculate the length of slope or anything other...?
Answer
2
Dipesh Kumar Karesia
Subject: Physics
, asked on 22/5/18
how to integrate this ... plz solve by explaining each little step...?
Q).
$S={\int}_{0}^{5}\left(3{t}^{2}\right)dt$
Answer
1
Dev Puri
Subject: Physics
, asked on 20/5/18
Q. Given below is a v-t graph. Draw a corresponding a-t graph and explain the motion of the body through the graph
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
multiple options are correct
Q.112. The forces each numerically equal to 5 N, are acting as shown in the figure.
(A) The magnitude of resultant force is 5
$\sqrt{3}$
N
(B) The magnitude of resultant force is 5 N
(C) The resultant vector is at 30
$\xb0$
with + ve x axis
(D) The resultant vector is at 120
$\xb0$
with + ve x axis
Answer
2
Deepanshi Garg
Subject: Physics
, asked on 19/5/18
A stone is dropped into a well and the sound of splash is heard after 5.33 seconds. if the water is at the depth of 122.5 m from the ground . the velocity of sound in air is
Answer
1
Deepanshi Garg
Subject: Physics
, asked on 19/5/18
From the top of a tower 36 m high, a body is dropped and at the same time another body is projected vertically upwards from the ground . if they meet mid-way , find the initial velocity of the projected body and its velocity when two bodies come together.
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q.10. The velocity of a moving point v =
$\left(2t+8{t}^{-2}\right)$
m/s. Find the path covered by the point during the
${2}^{nd}$
second.
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q.9. A point moves with velocity v =
$\left(9{t}^{2}-8t\right)$
m/ s. Find the path covered by the point during the fourth second.
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
30. The acceleration of a particle moving along x axis varies as
a = 2t - 3 m/ s
^{2}
where t is in seconds. If velocity at t = 1s is 2 m /s then the velocity at t = 3s is
(A) 6 m/s (B) 8 m/s (C) 10 m/s (D) 4 m/s
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
If
$\overrightarrow{P}=\overrightarrow{Q}$
then which of the following is NOT correct
(A)
$\hat{P}=\hat{Q}$
(B)
$\left|\overrightarrow{P}\right|=\left|\overrightarrow{Q}\right|$
(C)
$P\hat{Q}=Q\hat{P}$
(D)
$\overrightarrow{P}+\overrightarrow{Q}=\hat{P}+\hat{Q}$
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q.7. If the sum of two unit vectors is a unit vector, then magnitude of difference is
(A)
$\sqrt{2}$
(B)
$\sqrt{3}$
(C)
$\frac{1}{\sqrt{2}}$
(D)
$\sqrt{5}$
Answer
3
Neil Singh
Subject: Physics
, asked on 18/5/18
Why is path length a scalar quantity?? By the help of the co-ordinate system we can easily say what the direction of magnitude is. Since the direction can be known with the +or- sign then it should be a vector quantity. Pls explain.
Answer
1
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Q). $S={\int}_{0}^{5}\left(3{t}^{2}\right)dt$

Q.112. The forces each numerically equal to 5 N, are acting as shown in the figure.

(A) The magnitude of resultant force is 5$\sqrt{3}$ N

(B) The magnitude of resultant force is 5 N

(C) The resultant vector is at 30$\xb0$ with + ve x axis

(D) The resultant vector is at 120$\xb0$ with + ve x axis

Q.10. The velocity of a moving point v = $\left(2t+8{t}^{-2}\right)$ m/s. Find the path covered by the point during the ${2}^{nd}$ second.

Q.9. A point moves with velocity v = $\left(9{t}^{2}-8t\right)$ m/ s. Find the path covered by the point during the fourth second.

30. The acceleration of a particle moving along x axis varies as

a = 2t - 3 m/ s

^{2}where t is in seconds. If velocity at t = 1s is 2 m /s then the velocity at t = 3s is

(A) 6 m/s (B) 8 m/s (C) 10 m/s (D) 4 m/s

(A) $\hat{P}=\hat{Q}$ (B) $\left|\overrightarrow{P}\right|=\left|\overrightarrow{Q}\right|$ (C) $P\hat{Q}=Q\hat{P}$ (D) $\overrightarrow{P}+\overrightarrow{Q}=\hat{P}+\hat{Q}$

Q.7. If the sum of two unit vectors is a unit vector, then magnitude of difference is

(A) $\sqrt{2}$

(B) $\sqrt{3}$

(C) $\frac{1}{\sqrt{2}}$

(D) $\sqrt{5}$