All Questions
11
questions
-1
votes
4
answers
125
views
Initial velocity of a body when the distance travelled by it in the last second before reaching its maximum height is $5\ \textrm{m}$ [closed]
I stumbled upon this problem recently, and it has been haunting me for more than a day at this point. The question is as follows:-
When a ball is thrown up, it reaches a maximum height of $h$, ...
- 103
8
votes
6
answers
1k
views
How to find the falling time of an object when acceleration is not a constant? [closed]
Let's say we are throwing an object from the surface of the earth, this object reaches 70,000km with initial velocity of $10713 \mathrm{m}/\mathrm{s}$ until it reaches the peak high , the g value at ...
- 81
1
vote
2
answers
119
views
How to solve this long distance projectile problem? [closed]
A projectile is fired horizontally from the top of a mountain of height 'h' at a very high velocity. The projectile almost completes one revolution around the earth and crash lands at the bottom of ...
- 337
1
vote
1
answer
114
views
Beads on a frictionless frame of wire [closed]
I was doing a physics problem and though I have the solution, I have derived a general result which I would like to get verified. I will state the problem here :
Two beads q1, q2 of equal mass m can ...
- 73
-1
votes
1
answer
39
views
Vertical motion [closed]
Ball $A$ is thrown vertically upward from the top of a $30$ m high building with an initial velocity of $5$ m/s. At the same instant, another ball $B$ is thrown upward from the ground with an initial ...
1
vote
3
answers
557
views
What is the effect of acceleration due to gravity on horizontal acceleration?
The question is the following:
An object accelerates from rest to $100\,\mathrm{km}$ per hour in $4.0\,\text{seconds}$. What fraction of the acceleration due to gravity is the car's acceleration?
...
- 95
0
votes
1
answer
26
views
Finding the continuous increase in speed while diving toward the ground
https://youtu.be/HJO6WuoytGA?t=39s
In this game, the character jumps from the top of the Empire State Building (443.2m), and in a fraction of a second, he breaks Mach 1 just by releasing a great deal ...
- 1
0
votes
2
answers
203
views
Is there a mistake in this example in my mechanics textbook?
This is a worked example in my mechanics book:
But I think this worked example is wrong. In the 6th line. shouldn't $X=4R$ as the expression for distance above the surface is $(X-R)$ and when the ...
- 2,137
2
votes
5
answers
2k
views
How does this shell hit the aircraft?
A fighter aircraft is flying horizontally at an altitude of 1500m
with speed of 200m/s. The aircraft passes directly overhead an
anti-aircraft gun. The muzzle speed of the gun is 600m/s.
We ...
- 175
-2
votes
1
answer
907
views
Simple pendulum and planet mass [closed]
A simple pendulum, $20cm$ in length, has the period of $2.7s$ on a certain planet. Find the mass of the planet if its diameter is $18000km$. $G=6.67\times10^{-11}Nm^2/kg^2 $
I have no idea how to get ...
- 99
2
votes
0
answers
380
views
How to model an accelerometer measurements on a car wheel?
I am working on kinematically modelling an accelerometer on a car wheel.
When working on the initial conditions, I am confused whether or not I should use the gravitational acceleration since there ...
- 21