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
Artyom0805 [142]
2 years ago
5

Listed below are four activities. In which activity is friction useful?

Physics
1 answer:
Likurg_2 [28]2 years ago
4 0

Answer:

a. climbing up a cliff

Explanation:

You might be interested in
a carbon atom with 6 proton and 6 neutron in its nucleus is called carbon-12 the carbon atom with 8 neutrons is called what
daser333 [38]

Answer:

carbon-14 must be the answer

4 0
3 years ago
Help please asap due 20 minutes please help me ​
Finger [1]
Did you turn it in yet?
4 0
3 years ago
You work at a garden store for the summer, and you lift a 14 kg bag of fertilizer with a force of 227 N.
nika2105 [10]

Answer:

(a) Acceleration of the bag will be a=16.214m/sec^2  

(B) Weight of the bag will be 137.2 N

Explanation:

We have given mass of the bag m = 14 kg

Force with which bag is lifted = 227 N

(A) According to newtons law we force is equal to F = ma , here m is mass and a is acceleration

So 227=14\times a

a=16.214m/sec^2

(b) Acceleration due to gravity g=9.8m/sec^2

We know that weight is given by W = mg , here m is mass and g is acceleration due to gravity

So weight W=mg=14\times 9.8=137.2N

So weight of the bag will be 137.2 N

8 0
3 years ago
There is a plate with moment of inertia Ip = 0.0711 kgm2 , rotating around its center of mass with angular speed of 4.53 rad/s.
Anna007 [38]

Answer:

1) their common angular speed = 3.038 rad/s

2) kinetic energy loss = 0.24J

Explanation:

1) This is a case of conservation of angular momentum.

The initial angular momentum must be equal to the final angular momentum

Initial angular momentum = I x w

Where I = moment of inertia, and

w = angular momentum.

Initial angular momentum = 0.0711 x 4.53 = 0.322 kg-m2-rad/s

After addition of ring, moment of inertia becomes,

0.0711 + 0.0353 = 0.106 kg-m2

Therefore, final angular momentum will be

0.106 x Wf

Where Wf = final common angular velocity

Equating the two angular momentum we have

0.322 = 0.106Wf

Wf = 0.322/0.106 = 3.038 rad/s

2) KE = 1/2 x I x w^2

Initial KE = 1/2 x 0.0711 x 4.53^2

= 0.729 J

Final KE = 1/2 x 0.106 x 3.038^2

= 0.489 J

Loss in KE = 0.729 - 0.489 = 0.24 J

5 0
3 years ago
An ultrasound wave vibrates 30,000 times per second. what is the frequency
erica [24]
Frequency is given in units of Hertz (Hz) and is defined as the number of cycles per second.  The sound wave has 30,000 cycles per second, so its frequency is 30,000Hz.
This is more conveniently expressed as 30kHz, where the k indicates a multiplier of 1,000.
5 0
3 years ago
Other questions:
  • An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. what maximum height does she
    9·1 answer
  • Consider the possible scenarios and determine which of them are true for positive feedbacks or negative feedbacks.A. Increased p
    12·1 answer
  • As an object is undergoing free fall motion.As it falls the objects?,speed increases,acceleration increases,both of these,or non
    10·1 answer
  • How does cycling if matter occur in earths mantle
    7·1 answer
  • Each water molecule is joined to _____ other water molecules by ____ bonds.
    14·2 answers
  • If I finished my growth spurt, will I still continue to grow taller? (I’m a 14 year old male by the way)
    15·2 answers
  • When can a theory be modified if a new type of technology allows for new observations that raise new questions?
    9·2 answers
  • Can someone pls explain this question to me. Thanks in advance! ​
    11·1 answer
  • Tori applies a force of 20 newtons to move a bookcase with a mass of 40 kg. What
    9·1 answer
  • Me izz in canada hehe Xd<br>just in 2 mins wow​<br><br>what is immunization?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!