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kolbaska11 [484]
3 years ago
5

A bicycle wheel with radius 0.3 m rotates from rest to 3 rev/s in 5 s. What is the magnitude and direction of the total accelera

tion vector at the edge of the wheel at 1.0 s?
Physics
1 answer:
AlekseyPX3 years ago
7 0

Answer:

Explanation:

Given

Radius of bicycle wheel r=0.3\ m

Initial angular velocity \omega _0=0

It rotates 3 revolution in 5 s therefore

\omega =2\pi 3=\6\pi =18.85\ rad/s

using \omega =\omega _0+\alpha t

where \alpha =angular\ acceleration

\omega =Final\ angular\ velocity

t=time

\alpha =\frac{18.85}{5}=3.77 rad/s^2

Total acceleration of any point will be a vector sum of tangential acceleration and centripetal acceleration

\omega at t=1

\omega =0+3.77\times 1=3.77 rad/s

a_c=\omega ^2\cdot r

a_c=(3.77)^2\cdot 0.3=4.26 m/s^2

Tangential acceleration a_t=\alpha \times r

a_t=3.77\times 0.3=1.13 m/s^2

a_{net}=\sqrt{a_t^2+a_c^2}

a_{net}=\sqrt{(1.13)^2+(4.26)^2}

a_{net}=4.41 m/s^2

                       

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4 0
2 years ago
The magnitude of the frictional force along the plane is most nearly​
Svetach [21]

Answer:

F = N*μ or F =m*g*μ

Explanation:

The friction force is defined as the product of the normal force by the corresponding friction factor.

When a body is in equilibrium over a horizontal plane its normal force value shall be equal to:

N = m*g\\where:\\m=mass [kg]\\g=gravity [m/s^2]\\N= normal force [N]

if we simplify this formula more for a balanced body on a horizontal plane, we will have.

F=m*g*u

3 0
3 years ago
PLZ HELP, GIVING BRAINLIEST!!!
Y_Kistochka [10]

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Therefore, using a snow blower is more powerful than using a shovel.

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6 0
3 years ago
A sample of an unknown gas has a density of 0.0009 g/cm3.
Gnoma [55]

Answer:   A

The option A is the most accurate description of unknown gas density relative to other gases in the table.

Observe the table clearly and compare it with given density of unknown gas i.e., <em>0.0009 g/cm³ . </em>

In the table, it is given that

1. Hydrogen  - 0.00009 g/cm³, which is less than 0.0009 g/cm³, because the value of hydrogen has four zeros after the decimal point on right side, (that is decimal zero places up to ten thousands) but when comparing the value of unknown gas, it has zeros up to thousands place only on right side.

Hence, while moving on right side of the decimal point, the number of zeros decreases the value of given number.

(0.00009 > 0.0009)

similarly  observe the remaining values

2. 0.0009  >  0.00018 (Helium)

3. 0.0009  <  0.00122 (AIr)

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<em>So, answer is A. </em>


8 0
3 years ago
Read 2 more answers
I have a voltage source of 12V but a light that only burns at 5V. The lamp works on 18 mA. Calculate the resistance that you EXT
Gala2k [10]

Answer:

The resistance that will provide this potential drop is 388.89 ohms.

Explanation:

Given;

Voltage source, E = 12 V

Voltage rating of the lamp, V = 5 V

Current through the lamp, I = 18 mA

Extra voltage or potential drop = 12 V - 5 V = 7 V

The resistance that will provide this potential drop (7 V) is calculated as follows:

R = \frac{V}{I} = \frac{7 \ V}{18 \times 10^{-3} A} \ = 388.89 \ ohms

Therefore, the resistance that will provide this potential drop is 388.89 ohms.

5 0
3 years ago
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