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lina2011 [118]
3 years ago
10

The propeller on a boat motor is initially rotating at 8 revolutions per second. As the boat captain reduces the boat speed, the

propeller SLOWS at a steady rate of 0.9 revolutions per second per second. After 17 revolutions, how fast is the propeller spinning in revolutions per second
Physics
1 answer:
I am Lyosha [343]3 years ago
5 0

Answer: 5.77\ rps

Explanation:

Given

Initial angular velocity is \omega_i=8\ rps

rate of reduction \alpha=0.9 rev/s^2

after 17 revolution i.e. \theta =17\ rev

using \Rightarrow \omega_f^2-\omega_i^2=2\alpha\theta

Insert the values

\Rightarrow \omega_f^2=8^2-2\times (0.9)\times17\\\Rightarrow \omega_f^2=33.4\\\Rightarrow \omega_f=5.77\ rps

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A block of mass 8 m can move without friction
nekit [7.7K]

Answer:

Let M1 = 8 kg and M2 = 34 kg

F = M a = (M1 + M2) a

F = M2 g     the net force accelerating the system

M2 g = (M1 + M2) a

a = M2 / (M1 + M2) g = 34 / (42) g = .81 g = 7.9 m/s^2

5 0
2 years ago
In order to make an object stop, what direction does the unbalanced force need to be applied?
nataly862011 [7]
Against the object in motion
6 0
4 years ago
An electron moves through a uniform electric field E = (2.00î + 5.40ĵ) V/m and a uniform magnetic field B = 0.400k T. Determine
EleoNora [17]

Answer:a=1.75\times 10^{21}\left ( 2\hat{i}5.08\hat{j}\right )

Explanation:

Given

Electric Field \vec{E}=2\hat{i}+5.4\hat{j}

\vec{B}=0.4\hat{k}\ T

velocity \vec{v}=8\hat{i} m/s

mass of electron m=9.1\times 10^{-31} kg

Force on a charge Particle moving in Magnetic Field

F=e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]

a=\frac{e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]}{m}

a=\frac{1.6\times 10^{-19}\left [ 2\hat{i}+5.4\hat{j}+\left ( 8\hat{i}\times 0.4\hat{k}\right )\right ]}{9.1\times 10^{-31}}  

a=1.75\times 10^{21}\left ( 2\hat{i}+5.08\hat{j}\right )\ m/s^2

7 0
3 years ago
Objects that absorb shorter wavelengths of light are perceived as ______, those that absorb longer wavelengths are perceived as
miss Akunina [59]

According to the visible spectrum, we can deduce the following:

  1. Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
  2. Objects that absorb longer wavelengths are perceived as <u>blue</u>.
  3. Objects that reflect all wavelengths are perceived as <u>white</u>.
  4. Objects that absorb all wavelengths are perceived as <u>black</u>.

<h3>What is light?</h3>

Light can be defined as a form of electromagnetic waves (radiation) that do not require any medium for its propagation. Thus, light is generally referred to as a visual signal because it can be seen with the eyes.

<h3>The wavelength of light.</h3>

Based on scientific records, the wavelengths of light that can be seen by humans with their eyes is between the range of 400 to 750 nanometers (nm).

According to the visible spectrum, we can deduce the following:

  1. Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
  2. Objects that absorb longer wavelengths are perceived as <u>blue</u>.
  3. Objects that reflect all wavelengths are perceived as <u>white</u>.
  4. Objects that absorb all wavelengths are perceived as <u>black</u>.

Read more on wavelength here: brainly.com/question/25699025

4 0
2 years ago
6. What is the mass of a boy who is standing on top of a 1.5 meter high
puteri [66]

Answer:

m = 50 [kg]

Explanation:

The potential energy can be calculated by means of the following equation.

E_{p}=m*g*h

where:

Ep = potential energy = 735 [J]

m = mass [kg]

g = gravity acceleration = 9.81 [m/s²]

h = elevation = 1.5 [m]

Now replacing:

735=m*9.81*1.5\\m = 50 [kg]

8 0
3 years ago
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