The velocity of a car changes from 20 m/s east to 5 m/s east in 5 seconds. What is the acceleration of the car?

Answers

Answer 1

Answer: To solve this remember a=change in v/t, assuming the direction for the velocity, is + positive east. You can calculate it simply by this. A=v/t= A=5-20/5= A=-15/5= A=-3m/s squared. Change in velocity= vf-vi.

Related Questions

Which of these units results when a distance of 35 m is multiplied by a force of 27 n, and then divided by a time of 5s? a newtom n is kg * m/s2 in si base units?
Jose’s lab instructor gives him a solution of sodium phosphate that is buffered to a pH of 4. Because of an error that he made while calibrating the pH meter, Jose’s measurements of the pH of the sodium phosphate solution are 5.4, 5.4, and 5.4. Which statement best describes his results?
What’s the kinetic energy of the object? Use .Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot’s kinetic energy is joules.
make a small dipole by bringing the two charges very close to each other, where they are barely touching. the midpoint of the two charges should still be on one of the grid point intersections (see figure below). measure the strength of the electric field 0.5 m directly above the midpoint as well as 1 m directly above. does the strength of the electric field decrease as 1 over distance squared ( 1/r2 )? view available hint(s)
What causes objects to fall on earth and what is the rate at which this occurs?

What is the purpose of sensory adaptation

Answers

Sensory adaptation is when the sensory receptors change and adapt to different stimuli. For example in a darkened room your pupils enlarge allowing more of the available light in. This is why you can see a little better in the dark after you get used to it.

Sensory adaptation is a phenomenon in which sensory neurons change their level of sensitivity to a constant stimulus over time. This adaptation allows people to adapt to their environments while balancing the need to receive new sensory input. Neurons involved with smell, hearing, taste, touch, and sight can all exhibit this phenomenon.

Potassium hydroxide (KOH) and hydrochloric acid (HCl) react in a beaker. They form potassium chloride (KCl) and water (H2O). What type of reaction is this?

Answers

Potassium hydroxide (KOH) and hydrochloric acid (HCl) react in a beaker. They form potassium chloride (KCl) and water (H2O). This type of reaction is a double replacement reaction wherein the two principal reactants exchange after the reaction. The Cl will combine to the K forming KCl and the H will add to the OH forming H2O.

Answer:

B double replacement reaction

Explanation:

took the test

suppose that you look into a photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 400mm, the distance between the photometer to lamp 2 is 200 mm, and the intensity of lamp 2 is known to be 15 candelas, what is the intensity to lamp 1?

Answers

Use the Inverse square law, Intensity (I) of a light is inversely proportional to the square of the distance(d).

I=1/(d*d)

Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.

L1/L2=(D2*D2)/(D1*D1)

L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 candela

Explain the difference between a conductor and an insulator. Give two examples of each.

Answers

There are different kinds of conductors, most notably electrical and thermal conductors. But they are often inclusive of each other (electrical conductors are typically good thermal conductors).A conductor transmits something through its body with high efficiency while an insulator does not transmit very well. In the case of electricity, a conductor transmits electrical energy between two points while an insulator blocks the flow of electricity.Two examples of conductors are copper and silver. Two examples of insulators are wood and styrofoam.

Dogs are able to hear much higher frequencies than humans are capable of detecting. For this reason, dog whistles that are inaudible to the human ear can be heard easily by a dog. If a dog whistle has a frequency of 30000 Hz, what is the wavelength of the sound emitted?

Answers

The wavelength of the sound emitted is 3.33 x 10⁵ m.

What is wavelength?

The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.

Wavelength λ = 1/f

If a dog whistle has a frequency of 30000 Hz, then the wavelength will be

λ = 1/f

λ = 1/30000

λ = 3.33 x 10⁵ m

Thus, the wavelength of the sound of dog emitted is 3.33 x 10⁵ m

Learn more about wavelength.

brainly.com/question/13533093

#SPJ2

Wavelength = 1/frequency thus wavelength =1/30000

What is the magnitude of g at a height above Earth’s surface where free- fall acceleration equals 6.5 m/s2 ?