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Crazy boy [7]
2 years ago
15

An object is traveling at a constant velocity of 15 m/s when it experiences a constant acceleration of 3.5 m/s2 for a time of 11

s. What will its velocity be after that acceleration?
Physics
1 answer:
Luda [366]2 years ago
7 0

Vf=Vi+at=15m/s+(3.5m/s^2)(11s)=53.5m/s

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To overcome an object's inertia, it must be acted upon by __________. A. gravity B. energy C. force D. acceleration
astra-53 [7]
In order to overcome an object’s inertia (resistance to change), it must be acted upon by an unbalanced force, so the answer to the problem is letter C.
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1 year ago
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Image that the radiation emitted by the nitrogen at a frequency of 8.88×1014 Hz is absorbed by an electron in a molecule of meth
kiruha [24]

Answer:

5.07\cdot 10^{-7} m (507 nm)

Explanation:

First of all let's calculate the energy of the photon absorbed by the electron, This is given by

E=hf

where

h is the Planck constant

f=8.88\cdot 10^{14} Hz is the frequency of the photon

Substituting,

E=(6.63\cdot 10^{-34}Js)(8.88\cdot 10^{14}Hz)=5.89\cdot 10^{-19} J

The energy of the second photon, the one emitted when the electron drops to the intermediate energy level, is 2/3 of this energy:

E'=\frac{2}{3}E=\frac{2}{3}(5.89\cdot 10^{-19} J)=3.92\cdot 10^{-19} J

The relationship between the energy of the photon and its wavelength \lambda is

E=\frac{hc}{\lambda}

where c is the speed of light. Solving for \lambda, we find the wavelength:

\lambda=\frac{hc}{E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{3.92\cdot 10^{-19} J}=5.07\cdot 10^{-7} m

3 0
2 years ago
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Calculate the volume of a liquid with a density of 5.45 g/ml and a mass of 65g
katrin [286]
Density=mass/volume
5.45g/ml=65g/V
V=65g/5.42g/ml
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5 0
2 years ago
A 1000-kg car is slowly picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static f
Snezhnost [94]

Answer:

18.5 m/s

Explanation:

On a horizontal curve, the frictional force provides the centripetal force that keeps the car in circular motion:

\mu mg = m\frac{v^2}{r}

where

\mu is the coefficient of static friction between the tires and the road

m is the mass of the car

g is the gravitational acceleration

v is the speed of the car

r is the radius of the curve

Re-arranging the equation,

v=\sqrt{\mu gr}

And by substituting the data of the problem, we find the speed at which the car begins to skid:

v=\sqrt{(0.350)(9.8 m/s^2)(100 m)}=18.5 m/s

7 0
2 years ago
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A particle at 9 AM is moving towards the east at 4 ms At 12 noon, it changes its velocity and starts moving towards the north un
nexus9112 [7]

Answer:

Explanation:

Acceleration is the time rate of change of velocity.

Acceleration and velocity are vectors

If east and north are the positive directions, the east moving vector is reduced to zero and the north moving vector increases from zero to 4 m/s.

There are 3 hours or 10800 seconds between 10 AM and 1 PM

a1 = √((-4)² + 4²) / 10800 = (√32) / 10800 m/s² ≈ 4.2 x 10⁻⁴ m/s²

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7 0
2 years ago
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