Pierre Holmes
2022-07-21
Answered

Explain Does Newton’s second law hold true for an observer in a van as it speeds up, slows down, or rounds a corner?

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autarhie6i

Answered 2022-07-22
Author has **18** answers

A person traveling in a vehicle has the same velocity as the velocity of the vehicle. The effective velocity of the person speeds up as slow down with respect to the speed of the vehicle.

When the car takes a turn, the person in the car is subjected to have same centripetal force that is been experienced by the car.

This tells why the person still moves forward when the car stops abruptly. Therefore, Newton’s second law is applicable to any body in motion.

When the car takes a turn, the person in the car is subjected to have same centripetal force that is been experienced by the car.

This tells why the person still moves forward when the car stops abruptly. Therefore, Newton’s second law is applicable to any body in motion.

asked 2020-10-28

Ropes 3m and 5m in length are fastened to a holiday decoration that is suspended over a town square. The declaration has a mass of 5kg. The ropes, fastened at different heights, make angles of 52 degrees and 40 degrees with the horizontal. Find the tension in each wire and the magnitude of each tension.

asked 2022-07-22

Define net force, external force, and system. Apply Newton’s second law to determine the weight of an object

asked 2022-05-09

I have heard that no one escape from the intense gravitational field of a black hole (obviously that's why it is black). And gravitational force is due to the mass having the body, no mass no gravity, as

$F=GMm/{r}^{2}$

Putting 0 in one of the two bodies' masses, gives no gravitational force. But light cannot escape from black hole due to its strong gravity, does that mean that light has mass? please correct me.

$F=GMm/{r}^{2}$

Putting 0 in one of the two bodies' masses, gives no gravitational force. But light cannot escape from black hole due to its strong gravity, does that mean that light has mass? please correct me.

asked 2022-05-08

The gravitational force between a planet and its moon is $6\times {10}^{16}N$. For another moon orbiting the same planet with twice the orbital radius and 3 times the mass, what is the gravitational force?

asked 2022-07-17

Describe the gravitational forces.

asked 2022-07-14

Non-Constant Acceleration due to Gravity

Recently, I had the first physics lab for my university physics course. This lab was fairly simple, as we were merely using a computer and a distance sensor to graph the position, velocity, and acceleration of a cart as it moved along a linear track.

One of the situations we captured data for involved starting the cart at the bottom of an inclined ramp and giving it a push upwards. As expected, it rolled up, came to a stop, and then came back down the track to its starting position. The position-vs-time graph was essentially parabolic, the velocity-vs-time graph was essentially linear, and the acceleration-vs-time graph was essentially linear. So far, so good.

At this point in the lab, the instructor pointed out that, if the data was examined closely, the acceleration of the cart was greater while the cart was traveling upwards than when the cart was traveling downwards (approximately $0.546\frac{m}{{s}^{2}}$ and $0.486\frac{m}{{s}^{2}}$, respectively), and asked us to determine why in our lab report.

Now, gravity was the only force acting upon the cart, and thus it's acceleration should be a constant, at least at the scale our experiment was conducted at, so these results are completely baffling my lab group. So far, we have proposed the following ideas, but none of them seem very plausible.

Doppler effect on the ultrasonic distance sensor

Friction

Air resistance

Human error

The first seems highly improbable, and the last three are more obfuscation and hand waving than actual theories.

Why does our experimental data show the acceleration due to gravity to change based on the direction the object is moving?

Recently, I had the first physics lab for my university physics course. This lab was fairly simple, as we were merely using a computer and a distance sensor to graph the position, velocity, and acceleration of a cart as it moved along a linear track.

One of the situations we captured data for involved starting the cart at the bottom of an inclined ramp and giving it a push upwards. As expected, it rolled up, came to a stop, and then came back down the track to its starting position. The position-vs-time graph was essentially parabolic, the velocity-vs-time graph was essentially linear, and the acceleration-vs-time graph was essentially linear. So far, so good.

At this point in the lab, the instructor pointed out that, if the data was examined closely, the acceleration of the cart was greater while the cart was traveling upwards than when the cart was traveling downwards (approximately $0.546\frac{m}{{s}^{2}}$ and $0.486\frac{m}{{s}^{2}}$, respectively), and asked us to determine why in our lab report.

Now, gravity was the only force acting upon the cart, and thus it's acceleration should be a constant, at least at the scale our experiment was conducted at, so these results are completely baffling my lab group. So far, we have proposed the following ideas, but none of them seem very plausible.

Doppler effect on the ultrasonic distance sensor

Friction

Air resistance

Human error

The first seems highly improbable, and the last three are more obfuscation and hand waving than actual theories.

Why does our experimental data show the acceleration due to gravity to change based on the direction the object is moving?

asked 2021-11-10

A car is stopped at a traffic light. It then travels along a straight road such that its distance from the light is given by $x\left(t\right)=b{t}^{2}-c{t}^{3}$ , where $b=2.40\frac{m}{{s}^{2}}$ and $c=0.120\frac{m}{{s}^{3}}$ (a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. (b) Calculate the instantaneous velocity of the car at t=0, t = 5.0 s, and t = 10.0 s. (c) How long after starting from rest is the car again at rest?