1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lutik1710 [3]
3 years ago
7

A 48.5 kg student runs down the sidewalk and jumps with a horizontal speed of 4.25 m/s onto a stationary skateboard. The student

and skateboard move down the sidewalk with a speed of 4.05 m/s. a) Find the mass of the skateboard. Answer in units of kg.
Physics
1 answer:
storchak [24]3 years ago
7 0

<u>Answer:</u>

2.39 kg

<u>Explanation:</u>

There is conservation of momentum here in this problem so we will use the following problem:

m_1u_1+m_2u_2=(m_1+m_2)v

where the mass of the student m_1 is 48.5 kg,

the mass of the skateboard m_2 is m_2 kg,

the initial speed of the student u_1 is 4.25 m/s; and

the speed of the student and skateboard  v is 4.05 m/s.

So substituting the given values in the above formula to get:

(48.5*4.25) + (m_2 * 0) = (48.5 + m_2 ) * 4.05

206.125=196.425+4.05m_2

206.125 - 196.425 = 4.05m_2

m_2=\frac{9.7}{4.05}

m_2=2.39

Therefore, the mass of the skateboard is 2.39 kg.

You might be interested in
A firework is designed so that when it is fired directly upwards, it explodes and splits into three equal-massed parts at its pe
Arturiano [62]

Answer:

the third piece landed 2\,\sqrt{2}  meters in a direction 45 degrees from the observer's right towards the front

Explanation:

Due to conservation of momentum, the momentum of the third piece must add to the other two momenta in vector from to render zero  (initial momentum of the firework on a plane parallel to ground. Therefore the momentum components of the third piece must have a component to the right equal in magnitude to the momentum of the piece that traveled to the left, and a momentum component pointing to the front of the observer of equal magnitude to that of the piece that traveled behind the observer. Then the direction of the third momentum must be at 45 degrees from the observer's right towards the observer's front.

Also, the magnitude of a momentum vector of such components, is given by the Pythagorean theorem. Recall also that the magnitudes of the momentum vectors of the first two pieces must be equal since they traveled equal distances.

|P_3|=\sqrt{P_1^2+P_2^2} \\|P_3|=\sqrt{P^2+P^2}\\|P_3|=\sqrt{2P^2}\\|P_3|=P\sqrt{2}

Then the distance traveled by the third piece must also keep this proportionality:

D_3=\sqrt{2} \,\,D\\D_3=\sqrt{2} \,*\,2\,\,meters\\D_3=2\,\sqrt{2} \,\,meters

4 0
3 years ago
How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better? A) The metal or plast
Rus_ich [418]
D
Determination of the general direction of the sound lessens its dispersion and it reaches the observers at a higher intensity, meaning it is louder.
5 0
3 years ago
Read 2 more answers
A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of
uysha [10]

Answer:

q = 4.04×10^-12C

n = 2.53×10^7

Explanation:

1. Electrostatic force on charge due to electrical field E is F = qE

Gravitational force due to weight of drop of mass M is F = mg, when net force is zero we have to find the charges on the drop.

2. Charge on drop: since gravitational force is acting downward, electric field is acting upward and we equate both equations.

Therefore, Fg = Fe

qe = mg

q = mg/E

q = 3.50×10^-9kg×9.8m/s²/8480N/c

q = 4.04 × 10^-12

3. Number of protons by quantitization law

n = q/e

n = 4.04× 10^-12/8480

n = 2.53× 10^7

8 0
3 years ago
Where is oceanic crust being formed?
Sever21 [200]
Oceanic crust is being formed it is because of the tectonic plates. Tectonic plates work because of volcanic eruption every time it will erupt the tectonic plates underground will have more pressure on magma, then below there will be a volcano thats why their is a volcano in ocean. The heat rises up then it will open, thats what we call divergent bounderies then their will be earthquakes form. Then another plate opens up and the crust is going down, it will stop if the volcano stops erupting because there is more lava left in volcano then it will go underwater and thats why oceanic crust is being formed.

#CarryOnLearning

Butbot na dili na tinuod ga timala ra ko ana
3 0
3 years ago
Meaning of live stock farming​
inessss [21]

Answer:

Livestock is commonly defined as domesticated animals raised in an agricultural setting to produce labor and commodities such as meat, eggs, milk, fur, leather, and wool. In particular, livestock, especially beef, dairy and sheep stocks, have out-sized influence on greenhouse gas emissions from agriculture

Explanation:

Hope You Understand. Sorry It's Too Late LOL

7 0
3 years ago
Other questions:
  • A gas occupies 140 mL at 35.0 and 97kPa. what wlll the volume be at STP?
    6·1 answer
  • A beam of red light is made to pass through two slits that are 3.55 E-3 meters apart. On a screen 2.25 meters away from the slit
    8·1 answer
  • Predict what would happen to an organism if food suddenly became more abundant?
    12·1 answer
  • 6. If Dr. Swasey is like most psychologists, where does she probably work?
    11·1 answer
  • A loop of area 0.250 m^2 is in a uniform 0.020 0-T magnetic field. If the flux through the loop is 3.83 × 10-3T· m2, what angle
    6·1 answer
  • In the Earth’s Northern Hemisphere, summer is about 94 days long, spring is about 92 days long, fall is about 90 days long and w
    8·1 answer
  • Use double replacement and combustion reaction in a sentence
    12·1 answer
  • This ray diagram shows the image formed when a candle is placed in front of
    15·1 answer
  • Which of the following statements is true about absolute zero?
    10·1 answer
  • Why do astronauts weigh less on the moon than on earth
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!