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
sladkih [1.3K]
3 years ago
10

A 21.0 kg shopping cart is moving with a velocity of 4.0 m / s. It strikes a 7.0 kg box that is initially at rest. They stick to

gether and continue moving at a new velocity. Assume that friction is negligible.
What was the momentum of the shopping cart before the collision? 168 kg dot m/s 84.0 kg dot m/s 44.0 kg dot m/s 0 kg dot m/s

What was the momentum of the box before the collision? 84.0 kg dot m/s 0 kg dot m/s 168 kg dot m/s 44.0 kg dot m/s

What is the velocity of the combined shopping cart/box wreckage after the collision? 4.0 m/s 7.64 m/s 2.6 m/s 0 m/s
Physics
1 answer:
jonny [76]3 years ago
8 0

Explanation:

Given that,

Mass of the shopping cart, m_s=21\ kg

Initial speed of the shopping cart, u_s=4\ m/s

Mass of the box, m_b=7\ kg

Initial speed of the box, u_b=0 (at rest)

They stick together and continue moving at a new velocity. It is a case of inelastic collision.

(a) The momentum of the shopping cart before the collision is given by :

p_s=m_s\times u_s\\\\p_s=21\times 4\\\\p_s=84\ kg-m/s

(b) The momentum of the box before the collision is given by :

p_b=m_b\times u_b\\\\p_b=7\times 0\\\\p_b=0

(c) The velocity of the combined shopping cart/box wreckage after the collision is given by using the conservation of momentum as :

m_su_s+m_bu_b=(m_s+m_b)V\\\\V=\dfrac{m_su_s+m_bu_b}{(m_s+m_b)}\\\\V=\dfrac{21\times 4+0}{(21+7)}\\\\V=3\ m/s

Hence, this is the required solution.

You might be interested in
Se tiene un objeto a una altura de 8 m generando 450 J de energía potencial cuál es la masa de dicho objeto
fgiga [73]

Answer:

5.73kg

Explanation:

Given data

Height = 8m

Potential Energy = 450J

Required

The mass of the object

From the following expression

PE=mgh

we can substitute g= 9.81m/s^2 and the other parameters to get mass m

450= m*9.81*8

450= m* 78.48

m= 450/78.48

m= 5.73kg

Hence the mass is 5.73kg

8 0
3 years ago
A runner has a speed of 5m/s and a mass of 130 kg what is his kinetic energy?
arlik [135]
M= 130 kg

v= 5 m/s

kinetik energy = ½• m•v²


= ½ • 130• 5²
= ½•130•25
= ½•3250
= 1625.
4 0
3 years ago
Read 2 more answers
What is the critical angle for light traveling from crown glass (n = 1.52) into water (n = 1.33)?
Flauer [41]

Answer:

61 degrees, I just did the test.

Explanation:

6 0
3 years ago
Read 2 more answers
PLS HELP!!!! If u help I will mark brainiest thx
tatyana61 [14]

Answer:

Semiconductor. sorry i'm late

Explanation:

8 0
3 years ago
A speeding car collides with an unlucky bug flying across the road. Which explains why the impact doesn’t equally damage the car
velikii [3]
The bug was a lot smaller than the car, that's for sure. The car is bigger and sturdier, while the bug is smaller and frail. The bug is so frail, that rather that putting a dent in the car, it splatters all over the car. The bug is very damaged (obviously), while the car just needs a good wash.
8 0
3 years ago
Other questions:
  • Can anyone solve this for me?? I need help ASAP!!
    13·1 answer
  • The height of a transverse wave from the midpoint to the crest or trough is the .
    5·2 answers
  • A machine has an efficiency of 80%. How much work must be done on the machine so to make it do 50,000 J of output work?
    11·1 answer
  • Two horses begin at rest. After a few seconds, horse A is traveling with a velocity of 10 m/s west, while horse B is traveling w
    8·1 answer
  • What type of reaction is shown below? *
    6·1 answer
  • The diameter of a sphere is measured to be 5.36 in. Find (a) the radius of the sphere in centimeters, (b) the surface area of th
    7·1 answer
  • A river with a flow rate of 7 m3/s discharges into a lake with a volume of 9,000,000 m3. The concentration of a particular VOC i
    9·1 answer
  • Solar panels generate electricity using photovoltaic cells that receive sunlight. to protect these cells from moisture while all
    11·2 answers
  • Pls help i am in8th grade k12
    11·1 answer
  • Help me pleaseee and answer correctly!!!!!
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!