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
Shkiper50 [21]
3 years ago
5

A boy and his skateboard have a combined mass of 65 kg. What is the speed of the boy and skateboard if they have a momentum of 2

75 kg • ?
Physics
2 answers:
Salsk061 [2.6K]3 years ago
8 0
Speed (s) = momentum (M) : mass (m)

s = 275kg * m/sec : 65 kg ≈ 4,23 m/sec
erma4kov [3.2K]3 years ago
4 0

Answer : The velocity is given by 4.2 m/s.

Explanation :

It is given that,

Mass of a boy and the skateboard is, m = 65 kg

The momentum of the combined system is, p = 275 kg m/s

We know that the momentum of a body is the product of its mass and the velocity with which it is moving.

i.e.

p=m\times v

or

v=\dfrac{p}{m}

v=\dfrac{275\  kg m/s }{65\  kg}

v=4.2\ m/s

The speed of the boy and the skateboard is 4.2 m/s.

You might be interested in
Can someone right me a flooding psa ?
Elan Coil [88]
What’s that? Sorry??
7 0
3 years ago
Read 2 more answers
2.85 A police car is traveling at a velocity of 18.0 m/s due north, when a car zooms by at a constant velocity of 42.0 m/s due n
katrin2010 [14]

Answer:

11.1 s

Explanation:  

Speed of the police car as given = v = 18 m/s

Speed of the car = V = 42 m/s

Reaction time = t = 0.8 s

Distance traveled by the police car during the reaction time = d₁= 0.8 x 18 = 14.4 m

Distance traveled by speeding car = d₂ =0.8 x 42 = 33.6 m

Acceleration of the police car = a = 5 m/s/s

The police car can catch the speeding car only if it travels a distance equal to the speeding car in a time t.

Distance traveled by the police car = D = d₁ + v t +0.5 at², according to the kinematic equation.

⇒ D = 14.4 + 18 t + 0.5 (5) t²

⇒ D = 14.4 + 18 t+2.5 t²  → (1)

For the speeding car, distance traveled is D = 33.6 + 42 t, since it is constant velocity. Substitute for D from the above equation (1).

⇒ 14.4 + 18 t+2.5 t²=  33.6 + 42 t

⇒ 2.5 t² -24 t - 19.2 = 0

⇒ t = 10.3 s

Total time = t +0.8 s

⇒ Time taken for the police car to reach the speeding car = 10.3+0.8= 11.1 s

5 0
3 years ago
A 55 kg roller skater is at rest on a flat skating rink, a 198 N horizontal force is needed to set the skater in motion.
Rufina [12.5K]

Answer:

Explanation:

To get the person Moving you have to overcome the static (means not moving) friction coefficient.  U(static)

To get the person going at the same speed you have to overcome the kinetic friction coefficient. U(Kinetic)

Force to get him moving is 198 N.   Force = ma = U(static)Mg

combining the 2 equations you get 198N = U(static)* 55kg *9.8m/s^2   Solve for U(static)

Same equation to keep him moving except with the dynamic force and the dynamic U

 

175N=  U(kinetic)*55kg*9.8m/s^2  Solve (U dynamic)

8 0
3 years ago
A student is getting ready to go on a bike ride, but her bike’s back tire is flat! She connects a pump to the valve and adds air
Tems11 [23]

Answer: The answer is B. Higher than.

Explanation:

3 0
2 years ago
Read 2 more answers
as a hurricane or tropical storm approaches your location, it's forward speed decreases from 20 kt to 10 kt. How might this affe
zzz [600]

Answer:

The correct answer is c. More total rainfall from a slower moving storm.

When the the forward speed of the hurricanes and tropical storms slows down they tend to increase the rainfall. Because of the slow movement the storm can be for few days over a given region and produce rainfall without stopping, thus create major flooding, pilling up of the coastal water, and produce persistent strong winds even though they have decreased in their forward speed.

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • Allie is flying from New York to London. Her plane will most likely fly in the:
    6·2 answers
  • Which term describes the amount of heat needed to change 1 kg of a substance from solid to liquid at its melting point? A. Speci
    13·1 answer
  • How does mass effect my room?
    13·1 answer
  • What are day and night are produced by?
    12·2 answers
  • Sayid made a chart listing data of two colliding objects.
    10·1 answer
  • Object that is relatively close to mirror ray diagrams for convex mirrors
    15·1 answer
  • Q4. A particle starting from rest, travels with a = 5 m/s2. What is the distance traveled in 10 sec?
    6·1 answer
  • Explain the term diffraction​
    8·1 answer
  • Explain the difference between mass and weight and<br> how they are measured.
    10·1 answer
  • consider the points ​p(​,​,​) and ​q(​,​,​). a. find and state your answer in two​ forms: and aibjck. b. find the magnitude of .
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!