All categories

3 years ago

2) What are the directions of the velocity and acceleration of an object in

Physics

2 answers:

zaharov [31]3 years ago

7 0

Motion because the motion is the range

r-ruslan [8.4K]3 years ago

3 0

Uniform circular motion is when an object travels in a circular path at a constant speed.

Direction of the velocity is constant
Direction of the acceleration is inward.

You might be interested in

The earth makes one complete revolution around the sun in 365.24 days. Assuming that the orbit of the earth is circular and has

Anni [7]

Answer:

The magnitudes of the speed and acceleration of the Earth are approximately 66,661.217 miles per hour and 47.782 miles per square hour, respectively.

Explanation:

Given that the Earth has a circular orbit and make a revolution at constant speed around the Sun. Then, the kinematic formulas for the speed and acceleration of the planet are, respectively:

Speed

$v = \frac{2\pi\cdot R}{T}$ (1)

Acceleration

$a = \frac{4\pi^{2}\cdot R}{T^{2}}$ (2)

Where:

$v$ - Speed of the planet, measured in miles per hour.

$a$ - Acceleration of the planet, measured in miles per square hour.

$R$ - Radius of the orbit, measured in miles.

$T$ - Period of rotation, measured in hours.

If we know that $R = 93,000,000\,mi$ and $T = 8,765.76\,h$ , then the magnitudes of the speed and acceleration of the planet is:

$v = \frac{2\pi\cdot (93,000,000\,mi)}{8,765.76\,h}$

$v \approx 66,661.217\,\frac{mi}{h}$

$a = \frac{4\pi^{2}\cdot (93,000,000\,mi)}{(8,765.76\,h)^{2}}$

$a\approx 47.782\,\frac{mi}{h^{2}}$

The magnitudes of the speed and acceleration of the Earth are approximately 66,661.217 miles per hour and 47.782 miles per square hour, respectively.

3 0

3 years ago

Calculate the acceleration of a 1400-kg car that stops from 39 km/h "on a dime" (on a distance of 1.7 cm).

Vinil7 [7]

Answer:

$a=-3449.67\frac{m}{s^2}$

Explanation:

The car is under an uniforly accelerated motion. So, we use the kinematic equations. We calculate the acceleration from the following equation:

$v_f^2=v_0^2+2ax$

We convert the initial speed to $\frac{m}{s}$

$39\frac{km}{h}*\frac{1000m}{1km}*\frac{1h}{3600s}=10.83\frac{m}{s}$

The car stops, so its final speed is zero. Solving for a:

$a=\frac{v_0^2}{2x}\\a=-\frac{(10.83\frac{m}{s})^2}{2(1.7*10^{-2}m)}\\a=-3449.67\frac{m}{s^2}$

4 0

4 years ago

Give the number of significant figures: 832.000 km

Galina-37 [17]

It has three significant figure

8 0

4 years ago

Write a explanation explaining why red is a beautiful color is not a hypothesis

PIT_PIT [208]

Answer:

Please find the explanation below

Explanation:

A hypothesis in science is a testable explanation that is yet to be tested via experimentation. It is a predictive statement or suggested solution to an observation. A hypothesis aims at finding a possible explanation/answer to a question, which is subject to testing. One important aspect of formulating a hypothesis is that it tends to connect the independent variable with the dependent/measurable variable.

The statement "RED IS A BEAUTIFUL COLOR" cannot be considered a hypothesis because it does not aim to answer a question that can undergo experimental testing. This statement can not be measured via experimentation. The statement is not a possible answer to a question but rather a personal opinion about something.

5 0

3 years ago

to measure the static friction coefficient between a block and a vertical wall, a spring is attached to the block, is pushed on

Stolb23 [73]

Answer:

μ = mg/kx

Explanation:

Since the bock does not slip, the frictional force equals the weight of the block. So, F = mg. Now, the frictional force, F = μN where μ = coefficient of static friction and N = Normal force.

Now, the normal force equals the spring force F' = kx where k = spring constant and x = compression of spring.

N = F' = kx

So, F = μN = μkx

μkx = mg

So, μ = mg/kx

8 0

3 years ago