All Questions
Tagged with distance homework-and-exercises
61 questions
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Question on minimum distance between two projectiles, considering drag force [closed]
The following was a question posed in a recent test series:
What would the intended solution be to such a question? Are there any defining features that could be used to simplify the problem or is ...
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0
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83
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What is the line of sight distance across the ocean? [closed]
I just watched an experiment where they had a laser at a height of 50 feet (15 metre) above sea level and were able to see it 23 miles (37 km) away at a receiver which was 20 feet (6 metre) above sea ...
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33
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I need a ship at rest to accelerate under preferably constant acceleration/deceleration to arrive at rest at an object 55 AU away [duplicate]
I'm working on the story and I need help with the plot point. Assume that the energy needed for constant acceleration is not a problem. And there's no need to complicate this with outside forces.
I ...
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31
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Does work done by/against friction depend on path length or displacement? [closed]
On an equipotential surface, does the work done in moving/sliding a block of mass depend only on the initial and final position or the circuitous path (notwithstanding work done by or against friction ...
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71
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Number of meetings of $2$ cars starting from opposite ends of a road [closed]
Question:
$2$ cars travelling at $108,75$ kmph respectively, start from the opposite ends of a $90$ km straight road. Travelling back and forth continuously for $10$ hours, how many times do the $2$ ...
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3
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How is position calculated when the acceleration is not constant?
To get the position of an object we can use the equation: $$x=x_0+v_0t+\frac{1}{2}at^2$$
But now I don't have a constant acceleration, both $x_0$ and $v_0$ start at $0$ and $v$ ends at $16 \text{ m/s}$...
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2
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Shooting two projectiles at the same time with different mass [closed]
Shooting two projectiles having the same radius and in the same condition with the same initial velocity and angle
one with a mass of 10kg and the second with a mass of 100kg
which one of them will ...
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411
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How to calculate work, when force vector is diagonal, and object is moved diagonally at a different angle?
Suppose I have this scenario:
(a) The force vector is $[2, 4]$. (This means the $x$ component of the vector is $2$, and $y = 4$ ).
(b) The object is moved diagonally $[5, 6]$. (This means the ...
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1
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288
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Distance calculation without knowing time [closed]
I’m studying physics and am struggling to work out the correct formula for the below example question. Any help and explanation would be amazing.
A tourist being chased by a bear is running in a ...
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2
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Basic high school physics problem regarding the formula speed is the distance over time [closed]
A train 1 moves from a point $A$ in straight line at $38 km / h$ and after $2.5$ hours is followed by a train 2 which moves from the same point $A$ in straight line at $80$ km per hour. At which time ...
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597
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Range of a projectile as a function of launch angle [closed]
Goal: Derive an equation for range of a projectile as a function of launch angle if it started from a height > 0 and landed to height = 0
I know that the horizontal range
$$ R = \frac{v_0^2 \sin2\...
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1
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Hello, can anyone please help me understand and solve the problem? [closed]
ABCD is a track with a horizontal section BC of length 5 m. A 0.3 kg steel sphere is released from a point on the slope AB and it rolls towards the end D of the track. A stop watch was started shortly ...
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Travelled distance with accelerated movement knowing terminal velocity and time [closed]
So I have a body which moves straight on a line. The body accelerates from 0 m/s to some velocity V, the acceleration is constant and I know that after T seconds it reaches its final velocity V.
Is ...
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1
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Taking a frictionless object to a full stop given initial velocity and stopping distance [closed]
I am working on a simplistic simulation program where at some times I have to take an object to a full stop, while only knowing it's velocity and the distance in which it has to stop.
Though, I want ...
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Finding the distance travelled by a fly in a room from one lower corner to the diagonally opposite one [closed]
A room has a length of 4 meters, width of 5 meters and height of 3
meters. A fly is on one of the corners and walks to the diagonally
opposite one. What is the length of the shortest possible traveled ...
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63
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Graph of distance travelled in $n$th second with time
I was asked to graph the distance travelled in $n$th second by an object with time, taking the object to be at rest initially, and accelerating with a constant acceleration of $1 \, \text{m}/\text{s}^...
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181
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How to find distance travelled when the change in the force of gravity is not negligible? [duplicate]
Usually when on Earth we can use as an approximation:
g = a = 9.18 $\frac{m}{s^2}$
s = vi + 1/2 a$t^{2}$
However, how would I determine the distance traveled in situations where the the acceleration ...
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What is the difference between position, displacement, and distance traveled?
Suppose the question is somewhat like this:
If $v=8-4t$ and the position at time $t= 0\ \rm s$ is $2\ \rm m$, find the distance traveled, displacement, and final position at $t=3\...
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How much energy needed to cross the galaxy in time $t$?
Sorry if this is a dumb question.
A friend of mine just asserted that it's possible to get anywhere in the universe in less than 30 seconds of your time due to time dilation. I do imagine that'll ...
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Galactic Distances
I'm trying to show:
1 arcsec on the sky is approximately 5d parsecs at a galaxy, d parsecs away
Could someone show me a proof of this statement, because it is bamboozling me!
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4
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Two cannons are fired from a boat, boat A is closer and boat B further. Which gets hit first?
A battleship (X) simultaneously fires two cannons towards two enemy ships. One close by (A) and one far away (B). The canon leave the battleship at different angles and travel along trajectories. ...
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1
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Frog jumping on a plank floating on water [closed]
I don't want you to give me the answer of the problem, I only whant to know how to think it.
A frog of 200g is sitting at the end of a plank of 1kg and 1 m of length. The plank is at rest and ...
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1
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Show that the initial speed of the block and the bullet, after they began to move off together, was 1.3 m/s
A bullet of mass 2.0g is fired horizontally into a block of wood of mass 600g. The block is suspended from strings so that it is free to move in a vertical plane. The bullet buries itself in the block....
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What kinematic formula is this? [closed]
I think it's one of the kinematic equations but I don't recognize the form.
$$d = d_0 + \frac 1 2 a_{cc}t^2$$
It was given in a physics problem,where we are given points (x) and (y).
where $x = t^2$...
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One dimensional motion
I was recently solving a question which is as follows:
Displacement in a straight line motion varies as s=6+12t-2t^2. What distance will be covered in first five seconds?
I, actually, got stuck in ...
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Speed in min/km given distance in meters and time in seconds
How to calculate speed in min/km given distance in meters and time seconds? I used formula v = d/tbut having problems converting units.
I've tried ...
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2
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A basic question in kinematics [closed]
A particle moves along $x$-axis such that each position is given by $x(t)=2t^3-15t^2+36t+5$, $x$ is expressed in metres. Find the total distance within the time interval $t=0$ second to $t=4$ seconds.
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Displacement and position for a ball thrown up into the air
What would the displacement and distance traveled (from the starting point to the ending point) be for a ball that is thrown up into the air? (Hint: Think about the definition for displacement)
I can'...
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3
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2k
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Calculate the distance traveled when "braking" for fixed amount of time to a fixed velocity [closed]
I have the problem that I need to know how many steps I traveled when I go from velocity $a$ to $b$ in a fixed amount of time. I always know how long it will take me to go from velocity $a$ to ...
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2
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Given a known total stopping distance, how can I calculate the initial speed?
This would be my first question on Physics.stackexchange. As I looked closely if I would not double my question, I try dare to ask the question.
I am doing some calculations together with my kids. ...
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Why time squared ($t^2$) vs distance ($s$) graph is a straight line? [closed]
In the formula for kinematic constant acceleration $a$, where $s$ is displacement, $v_{i}$ initial velocity and $t$ time:
$s=v_{i}t + \frac{1}{2}at^2$
Why is that the graph $t^2$ vs $s$ happens to ...
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Movement of the point $A$ on the cylinder [closed]
We have a point $A$ on the top of a cylinder with radii $1$.After $2.5$ rolls find the movement of point $A$.(Take $\pi=3$ if needed)
For finding the movement of point $A$ we should use pytagoras to ...
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Kinematics of a particle
A swimmer jumps using a spring board. The board bends with distance $-X_0$. Then it accelerates him with $a_c = - \omega^2 x$ with $\omega =\mathrm{const}$. He loses contact at $x=0$, then he flies ...
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Does this calculation give displacement or distance?
So we have velocity as a function of time given $\overrightarrow{v}(t)=(1-2bt)k\overrightarrow{r_0}$ where $b,k$ are positive constants and $\overrightarrow{r_0}$ is a unit vector. It is found that if ...
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Projectile motion with air friction force/resistance [closed]
We have to find the x (the distance, if you didn't know that then I'm not sure if you should be doing this problem) that the projectile travel during the time in the air until the time it hits the ...
user121908
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Why is the first part of equation i.e $v_0(t_f-t_0)$ not considered while plugging real life problem to it? [closed]
Why is the speed*time stuff is not present while we look for the distance?
I got it from this (physics for dummies)
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1
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605
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How does one calculate how big something has to be, to be seen at a given distance? [closed]
Ignoring curvature of the Earth.
How do I calculate the size an object would need to be in order to appear to be approx 1cm tall at a given distance?
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Calculating position of a particle at time $t$ in a gravitational field
I'm working on a piece of code that is supposed to visualize a particle bouncing up and down from the ground (somehow magically we can give it velocity upwards when it is on the ground). I figured ...
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2
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Derivation of a kinematical equation [duplicate]
My question is, we can calculate distance of free falling objects with the equation of $d = \frac{1}{2}gt^2$ where $d$ is distance in meter, $t$ is time in seconds, but I wonder how we achieved this ...
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How to calculate distance travelled while car is rolling, given start and end speed?
I'm trying to calculate the distance travelled by my Formula Student racecar if it starts at a certain speed, goes into Neutral (no acceleration, no brakes, just rolling on its wheels), and ends at ...
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3
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273
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Why is there a contradiction in this Newton's equations of motion related question? [closed]
One second after being thrown straight down, an object is falling with a speed of 20 m/s. How much distance does the object travel in the first second?
We took:
$$v = 20\,{\rm m/s}$$
$$u = 0\,{\rm m/...
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Find Distance with Acceleration and Time
I'm working on Physics homework and have run into a problem I can't figure out. Any help would be much appreciated!
Problem:
Allison exerts a steady net force of 50N on a 22-kg shopping cart ...
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1
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2k
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Car Motion: Power and Distance: Air Drag [closed]
I need to workout the amount of Power required by a car, in order to overcome air drag forces. I have figured out that, Power = c(Velocity^3). But, I am unable to understand Power's relation with ...
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Given any metric, how to find the straight line path between two points? [closed]
Say we are given a two-dimensional metric
$$ds^2=f_1(x)dx^2+f_2(x)dy^2,$$
for any kind of function. How do we calculate the distance along a straight line path (not the shortest possibly) between, say,...
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709
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Solving distance with acceleration and velocity given and getting two different answers using two different equations [closed]
Frictional forces from brake pads are responsible for stopping an automobile. A car is moving at $35.0 \:\mathrm{m/s}$. If the car's brakes are capable of generating a deceleration rate of $6.00 \:\...
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Finding acceleration and distance when velocity given
I am trying to do the following question for practice (it is an interview question), and I don't know if my methods and answer are correct. Given a velocity $v=2+3t^2$, find acceleration after 3 ...
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1
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Finding the distance between two osclilating particles in a wave
Assume a wave function $\psi = \psi(x,t)$ where $x$ is position from the starting point $(0,0)$ and $t$ is time. Two oscillating points A and B are located at $x_1$ and $x_2$ respectively with $x_2 \...
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623
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Is in this case distance same as displacement? [closed]
I have this graph, and I need to know the displacement in the interval from 0 to 5 seconds, so I found the area of the rectangle that you can see there. A = wh, which means X = (5 seconds)(20 m/s), ...
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1
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2k
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What distance does one travels in his lifetime? [closed]
I think this isn't answerable without having point of reference from which speed at which earth travels in space, however if I am wrong the please give absolute distance.
Considering that earth spins ...
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3
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How to calculate the velocity of this body? [closed]
Graph of a train (the body) is provided which starts from rest. What is the velocity after the train has 10 metres displacement?
Thats the only things provided for the question, please help me out ...
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