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
adoni [48]
3 years ago
15

A 0.80 kg object tied to the end of a 2.0 m string swings as a pendulum. At the lowest point of its swing, the object has a kine

tic energy of 10 J. Determine the speed of the object at the instant when the string makes an angle of 50o with the vertical.
Physics
1 answer:
devlian [24]3 years ago
6 0

Answer:

3.32 m/s

Explanation:

From the law of conservation of energy, the sum of mechanical and kinetic energy should be equal to the 10 J given. Potential energy is given by mgh where m is mass, g is acceleration due to gravity and h is the height. For this case, h= l(1-cos\theta) and l is string length, given as 2 m, \theta is given as 50 degrees. Kinetic energy is given by 0.5mv^{2} and it is this velocity that is unknown.

10J=0.5\times 0.8kg\times v^{2}+ 0.8kg\times 9.81\times 2m(1-cos 50^{\circ})\\v\approx 3.32 m/s

You might be interested in
Antonina throws a coin straight up from a height of
vichka [17]

Answer:

s=vt-\frac{1}{2}gt^2

Explanation:

We could use the following suvat equation:

s=vt-\frac{1}{2}gt^2

where

s is the vertical displacement of the coin

v is its final velocity, when it hits the water

t is the time

g is the acceleration of gravity

Taking upward as positive direction, in this problem we have:

s = -1.2 m

g=-9.8 m/s^2

And the coin reaches the water when

t = 1.3 s

Substituting these data, we can find v:

v=\frac{s}{t}+\frac{1}{2}gt=-\frac{1.2}{1.3}+\frac{1}{2}(-9.8)(1.3)=-7.3 m/s

where the negative sign means the direction is downward.

5 0
3 years ago
What force is left out of the Quantum Mechanics theory?
nirvana33 [79]

Answer:

Quantum mechanics is a key hypothesis in material science that gives a portrayal of the actual properties of nature at the size of iotas and subatomic particles. It is the establishment of all quantum physical science including quantum science, quantum field hypothesis, quantum innovation, and quantum data science.

Explanation:

It is the greatest of issues, it is the littlest of issues. At present physicists have two separate rule books clarifying how nature functions. There is general relativity, which perfectly represents gravity and everything it overwhelms: circling planets, impacting worlds, the elements of the growing universe all in all. That is enormous. At that point there is quantum mechanics, which handles the other three powers – electromagnetism and the two atomic powers. Quantum hypothesis is very proficient at portraying what happens when a uranium molecule rots, or when singular particles of light hit a sun based cell. That is little.

4 0
3 years ago
A cinder cone is formed from relatively ________ viscosity magma with a ________ gas content. low; high high; high low; low high
kenny6666 [7]

<span>A cinder cone is formed from relatively low viscosity magma with a high gas content. Cinder cones are formed by the volcanic ash, cinders that are formed around the volcanic vent. Cinder cones have a bowl shaped crater and the shape of the cinder cones depend on the ejected particles that formed the cinder.</span>

5 0
3 years ago
Which term describes the point when two objects reach the same temperature and there is no longer a transfer of energy through h
yaroslaw [1]
The term you need to know is equilibrium. Technically it means that heat gained = heat lost. Normally in beginning chemistry classes the evidence for this condition is a stable temperature. 
5 0
3 years ago
The world will face energy crisis in near future justify this statement
jeka57 [31]

Answer:

Nowadays most of our works are being done through different types of energy which are non-renewable. People are wasting lot of energy (hydel, dolar etc.) due to which in future we can face energy crisis.

5 0
2 years ago
Other questions:
  • How would the composition of an atom change if both the atomic number and mass number each increase by one? A) The atom would ha
    15·1 answer
  • A tow truck is pulling 25,000 kg van with a tow hook that meets the van at an angle of 30° with the ground. How much force must
    11·1 answer
  • A person absentmindedly walks off the edge of a tall cliff. They will fall 50 m into either
    10·1 answer
  • An object of mass m is moving down an inclined plane that makes an angle they a with the horizontal and has height h. Which of t
    12·1 answer
  • An object, which is initially at rest, accelerates at a rate of 10 m/s2 . Its final position is 85 m from its initial position a
    5·1 answer
  • A wire loop of radius 0.37 m lies so that an external magnetic field of magnitude 0.35 T is perpendicular to the loop. The field
    15·1 answer
  • What is the definition of inertia? A. The amount of force required to reach the speed of light. B. The rate at which an object a
    7·2 answers
  • Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined plane and allowed t
    7·1 answer
  • 1)<br> How much time does it take to lift a box using 18.0 J of work and 20.89 Watt of power?
    5·1 answer
  • I need help immediately and thank you of if you answer the question
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!