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4 years ago

What is the car is acceleration if it increases its speed from 5 meters per second to 20 m/s in three seconds

1 answer:

7 0

Initial Velocity, u=5m/s
Final Velocity, v=20m/s
Time, t=3s
Then we have acceleration, a=(v-u)÷t
a=(20-5)÷3=15÷3=5

The final answer is 5m/s²

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Which has a greater buoyant force on it, a 25.0 cm3 piece of wood floating with part of its volume above water or a 25.0 cm3 pie

kozerog [31]

Answer:

piece of submerged iron

Explanation:

The buoyant force is given by:

$B=\rho_L V_{sub} g$

where

$\rho_L$ is the density of the liquid (in this case, water)

$V_{sub}$ is the submerged part of the object

g is the acceleration due to gravity

In this problem, the liquid used in the two examples is the same, water, so $\rho_L$ is the same; and g is the same as well. Therefore, the only difference between the two examples is $V_{sub}$ .

For the piece of wood, we are told that the object is floating, so only a fraction of its total volume of 25.0 cm3 will be submerged: therefore the submerged volume will be less than 25.0 cm3. On the contrary, the problem tells us that the piece of iron is submerged, so the submerged volume in this case is 25.0 cm3. Therefore, the submerged volume for the iron is greater than for the piece of wood, so the buoyant force of the piece of iron is greater.

8 0

3 years ago

The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash

Reil [10]

Answer:

$3.3\cdot 10^{15}$

Explanation:

First of all, let's calculate the energy of a single photon of wavelength

$\lambda=550 nm=5.5\cdot 10^{-7}m$

which is given by

$E_1 = \frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{5.5\cdot 10^{-7} m}=3.6\cdot 10^{-19} J$

The power of the flash is

$P=1.2 mW=0.0012 W$

and the time it lasts is

$t=100 ms=0.1 s$

so the total energy delivered in one flash is

$E=Pt=(0.0012 W)(0.1 s)=1.2\cdot 10^{-3}J$

This energy contains exactly N photons each of energy $E_1$ , so the number of photons emitted in one flash is

$N=\frac{E}{E_1}=\frac{1.2\cdot 10^{-3} W}{3.6\cdot 10^{-19}J}=3.3\cdot 10^{15}$

3 0

3 years ago

The towel has better blank

koban [17]

Answer:

Explanation:

Towels Absorb

5 0

3 years ago

As we move through the visible spectrum, red to violet (right to left in the image), the wavelength __________ and the frequency

Lynna [10]

<h3>Answer;</h3>

C) decreases; increases

<h3>Explanation;</h3>

As we move through the visible spectrum, red to violet (right to left in the image), the wavelength decreases and the frequency increases.
Electromagnetic spectrum comprises of electromagnetic waves arranged in the order of increasing or decreasing frequency and wavelength.
These electromagnetic waves includes; radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.
In electromagnetic spectrum as you move from left to right, that is from the radio waves towards the gamma rays, the wavelength decreases as the frequency increases; while from gamma rays towards the radio waves the wavelength increases while the frequency decreases.

6 0

3 years ago

Read 2 more answers

Will each of the following actions increase the distance between the diffraction spots? a) Increase the distance between the scr

diamong [38]

Answer:

A) no

B) no

C) yes

D) no

E) yes

5 0

3 years ago