Physics High School

A sled and rider, gliding over horizontal, frictionless ice at 4.7 m/s , have a combined mass of 74 kg . The sled then slides over a rough spot in the ice, slowing down to 2.9 m/s . What impulse was delivered to the sled by the friction force from the rough spot? Express your answer to two significant figures and include the appropriate units.

Answers

Answer 1

The Impulse is - 74 Ns

Impulse (symbolized by J or Imp) is the integral of a force, F, over the time interval, t, for which it acts.

The SI unit of impulse is the newton second (N⋅s)

Examples of impluse in real life could include hitting a ball,tossing a coin, kick starting scooter etc.

The values known to us are -

J =?

Mass (m) = 74 kg

Initial velocity (Vi) = 4 m/s

Final velocity (Vf) = 3 m/s

To find Impulse-

J = ΔP = m ( Vi-Vf)

J = 74kg ( 3m/s- 4m/s)

J = - 74 Ns

The impulse is -74Ns, here the negative sign indicates the direction of impulse, in the opposite direction of motion.

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Related Questions

What conditions can cause hurricanes to change direction?
need ASAP please

Answers

According to the research, the correct answer is that the conditions that affect hurricanes causing them to change direction are higher latitudes.

What are hurricanes?

It is a tropical cyclone that generates strong winds whose storms circulate around a center of low pressure.

In this sense, this phenomenon usually has its beginning in the tropics around the area of low pressure whose direction is influenced by the Coriolis effect that diverts the trajectory of objects that move over the Earth's surface and the higher latitudes that reverse the steering winds.

Therefore, we can conclude that higher latitudes and the Coriolis effect are conditions that affect the path of hurricanes by changing their direction.

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Explain your understanding of water waves: 1. Use your own words and captured images from the simulation to show you can measure: a. Wavelength of longest wave possible b. Wavelength of shortest wave possible c. Height of tallest wave possible 2. Describe your experiments to make waves of different wavelengths and heights including which views and tools were needed and why. Support your explanation with images from the simulation.

Answers

A Water waves are formed by the interaction between the earth, moon and the sun and usually of short wavelength.

Gamma rays have incredibly short wavelengths that are only a small percentage of the size of atoms, but other wavelengths can extend as far as the cosmos, despite the fact that the relationship between wave frequency and wavelength is inverse. Although it is not often stated explicitly, electromagnetic radiation wavelengths are frequently represented in terms of the vacuum wavelength, regardless of the medium they pass through.

Electromagnetic radiation's behavior is influenced by its wavelength. Wavelength times frequency equals the speed of light. Energy is obtained by multiplying frequency by the Planck constant. The wave number in centimeters is 1/wavelength. A rough estimate of the wavelength size is shown along with the wavelengths of various regions of the electromagnetic spectrum.

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Given: Assume the near point (of the eye) is 25 cm . The distance between eyepiece and objective lens in a certain compound microscope is l = 17.6 cm . The focal length of the eyepiece is fe = 2.57 cm , and that of the objective lens is fo = 0.3 cm . What is the overall magnification of the microscope? Caution: a negative quantity this is. Use the approximation l − fe ≈ l and object distance do is approximately the focal length fo.

Answers

The overall magnification of the microscope is - 570.687.

A microscope is a laboratory tool used to have a look at items which can be too small to be seen with the aid of the bare eye. Microscopy is the technology of investigating small objects and structures through the use of a microscope. The microscopic approach is invisible to the attention unless aided by using a microscope.

The focal length of a microscope objective is generally between 2 mm and 40 mm. but, that parameter is regularly considered as less important, on account that magnification and numerical aperture are sufficient for quantifying the critical performance in a microscope.

Calculation:-

M = -(L/f) (near point/Fe)

M = - (0.176/0.003)(0.25/0.0257)

M = - 570.687

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Julius is using the setup below to find the velocity of a wave in the ripple tank. He found the average
wavelength by measuring the distances between the shadow lines. What else does he need to know
in order to calculate the velocity of the waves?

Answers

He need to know in order to calculate the velocity of the waves is time.

What is velocity?

When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.

Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.

Given in the question,

Velocity =Distance /Time

He need to know in order to calculate the velocity of the waves is time.

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Lucy and her bike together have a mass of 120 kg. She slows down from 4. 5 m/s to 3. 5 m/s. How much kinetic energy does she lose?.

Answers

Answer:

The answer is - 480 kj

Explanation:

kinetic energy before: K1 = 1/2 *m*U1^2=} K1= 1/2*120*4.5^2=} K1= 60*4.5*4.5=} K1= 1,215 kj

kinetic energy after : K2=1/2 *m*U2^2=} K2= 1/2*120*3.5*3.5=} K2= 735 kj

if you want to find the kinetic energy that the mass has lost you need to do : K2-K1= 735-1.215= - 480 kj

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