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
STatiana [176]
2 years ago
8

A 45.0-kg girl stands on a 13.0-kg wagon holding two 18.0-kg weights. She throws the weights horizontally off the back of the wa

gon at a speed of 6.5 m/s relative to herself . Assuming that the wagon was at rest initially, what is the speed of the girl relative to the ground after she throws both weights at the same time
Physics
1 answer:
topjm [15]2 years ago
4 0

Answer:

v = 4.0 m/s

Explanation:

  • Assuming no external forces acting during the instant that the girl throws the weights, total momentum must be conserved.
  • Since all the masses at rest initially, the initial momentum must be zero.
  • So, due to momentum must keep constant, final momentum must be zero too, as follows:

       p_{f} = m_{w} * v_{w} + m_{g+w} *v_{g+w} = 0 (1)

  • Assuming the direction towards the back of the wagon as positive, and replacing the masses in (1), we can solve for vg, as follows:

       v_{g+w} =- \frac{m_{w} *v_{w}}{m_{g+w} } =  - \frac{36.0kg *6.5m/s}{58.0kg } = -4.0m/s  (2)

  • This means that the girl (along with the wagon on she is standing) will move at a speed of 4.0 m/s in an opposite direction to the one she threw the weights.
You might be interested in
Explain why the driver's reaction time affects the thinking distance.
Lemur [1.5K]

Answer:

The thinking distance depends on the reaction time of the driver which could can affected by alcohol, distractions and tiredness. A faster speed increases both thinking  distance, increasing the total stopping distance.

<h2><em>I hope this is helpful. Would appreciate if you add me as brainliest.</em></h2>
7 0
3 years ago
In the park, there are 25 pigeons, 15 squirrels, 5 rabbits, and 5 stray cats. Why
Debora [2.8K]

Answer: Line graph should be used to show how one variable changes over time not to show multiple categories or variables are at one specific point in time.

Explanation:

In maths, statistics, and related fields, graphs are used to visually display variables and their values. In the case of line graphs, these are mainly used to display evolution or change of a variable over time. For example, a line graph can show how the number of divorces changed from 1920 to 2010.

In this context, the number of different animals in the park cannot be represented through a line graph because this situation does not imply a variable changing over time. Moreover, this situation includes multiple variables or categories of animals and the data shows only one specific point in time, which can be better represented through a bar graph.

8 0
3 years ago
2. If you want 0. 250 a (250 milliamps) to flow around a circuit with a resistance of 400 ohms, what voltage do you need?
grigory [225]

Answer:

0.000625 V

Explanation:

The formula linking current , resistance and voltage is :

V = I/R

Voltage = Current / Resistance

Now we substitute values given in question :

Voltage = 0.250 / 400

Voltage (V) = 0.000625

Our final answer is 0.000625 V

Hope this helped and have a good day

5 0
1 year ago
What is angle between the vectors 2i -3j +K
Gnom [1K]

Answer:

the answer is B

Explanation:

edg 2020

3 0
3 years ago
In an experiment you are performing, your lab partner has measured the distance a cart has traveled: 28.4inch. You need the dist
weeeeeb [17]

Answer: The multiplication factor is 72.136 cm. This will give you the unit conversion when multiplied with 28.4 inch

Explanation:

1 inch = 2.54 cm

28.4 inches = x cm

Xcm= (28.4 inches × 2.54cm)/1 inch

X= 72.136

6 0
3 years ago
Other questions:
  • A snail travels at a rate of 2.37 feet per minute. a. Write a rule to describe the function. b. How far will the snail travel in
    5·2 answers
  • Will mark as brainliest if correct!!!!
    7·1 answer
  • Which of two factors influence the weight of an object due to gravitational pull?
    13·2 answers
  • A large magnetic flux change through a coil must induce a greater emf in the coil than a small flux change. A) True B) False
    7·1 answer
  • Which statement best describes the difference(s) between atoms and molecules?
    13·2 answers
  • Autorhythmic cells can generate action potentials spontaneously because they have Autorhythmic cells can generate action potenti
    15·2 answers
  • suppose you had two socks sticking together in the clothes dryer from static electricity.what happens if they are spun gently?
    13·1 answer
  • 1. ________________electricity is the type of electricity commonly used in homes and businesses throughout the world.
    6·1 answer
  • 1.A car goes off a cliff horizontally at 49 m/s and falls for 5 seconds
    12·1 answer
  • The dog has ran 100 meters in 20 seconds and then 300 meters in 25 seconds what was the average speed of the dog over the entire
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!