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
Sphinxa [80]
3 years ago
12

Which of the following statements is true?

Physics
2 answers:
erica [24]3 years ago
6 0

An object at rest has an instantaneous acceleration of zero is true.

Option B

<u>Explanation</u>:

As we all know, acceleration is given by a, and formula is F/m, where F is force applied and m is mass of an object. Considering Instaneneous acceleration, it means the force per unit mass body is feeling during infinitesimally small time. Let us say 1 microsecond, acceleration of the body during that span of time is known as instanteneous acceleration. Considering option A, it might not be always true, as consider a vehicle going in straight direction, speed is changing and not direction. Option D is not again true, as consider earth rotating around sun, direction is changing but not speed. However, as explained above, instantaneous acceleration is always constant, and hence, body at rest have instantaneous acceleration zero.

rosijanka [135]3 years ago
3 0
The correct answers would be B, and d
You might be interested in
The efficiency of a light source is the percentage of its energy input that gets radiated as visible light. if some of the blue
Anestetic [448]

The efficiency of a light source is the percentage of its energy input that gets radiated as visible light if some of the blue light in an led is used to cause a fluorescent material to glow the overall efficiency of the LED decreases.

How efficient is LED?

Different wavelengths that correlate to different visible colours are used in LED light therapy. Various shades pierce the skin at different rates.

  1. Your skin's outermost layer is impacted by blue light.
  2. Yellow light is more enveloping.
  3. Red light penetrates your skin more deeply.
  4. The deepest penetrating light is near-infrared.

Different LED hues have various effects. For instance, according to experts red LED light therapy has the potential to reduce inflammation and boost collagen formation, which declines with age and is crucial for maintaining youthful-looking skin.

Acne-causing bacteria may be destroyed by a blue LED light therapy (P. acnes).

Hence the answer is the overall efficiency of the LED decreases.

Learn more about wavelength here,

brainly.com/question/1263539

# SPJ4

7 0
2 years ago
A solution with a pH of seven must be <br> A. An acid <br> B. A base<br> C.neutral<br> D.water
Dmitry [639]
A pH scale goes from 0 - 14.
7 is in the middle so it is neutral
7 0
3 years ago
A person just supports a mass of 20kg suspended from a rope.
Georgia [21]

Answer:

F = 200 N

Explanation:

Given that,

The mass suspended from the rope, m = 20 kg

We need to find the resultant force acting on the rope. The resultant force on the rope is equal to its weight such that,

F = mg

Where

g is acceleration due to gravity

Put all the values,

F = 20 kg × 10 m/s²

F = 200 N

So, the resultant force on the mass is 200 N.

7 0
3 years ago
A 244.0 N block is at rest on a flat, frictionless table. A hooked cable applies an upward force of 24.0 N on the block. What is
blagie [28]

Answer:

268N

Explanation:

The upward force acting on the block are the reaction and the hooked table..

The total normal force acting = normal reaction + 24N

Note that the normal reaction is always equal the weight of the table

Hence the normal force acting in the block is 244.0+24 = 268.0N

4 0
3 years ago
Select the correct answer.
r-ruslan [8.4K]

Answer:

That would be B. Hope this helps!

Explanation:

Orion's Belt or the Belt of Orion, also known as the Three Kings or Three Sisters, is an asterism in the constellation Orion. It consists of the three bright stars Alnitak, Alnilam and Mintaka. Looking for Orion's Belt in the night sky is the easiest way to locate Orion in the sky.

3 0
3 years ago
Read 2 more answers
Other questions:
  • In which scenario does radiation occur?
    7·2 answers
  • The earth rotates once per day about its axis. where would you have to stand in order to have the smallest tangential speed?
    12·1 answer
  • Is the center of each galaxy a black hole containing new galaxy?
    13·1 answer
  • All chemical reactions occur at the same rate true or false​
    15·2 answers
  • How is the energy of a photon related to its wavelength?
    10·1 answer
  • A car is traveling 20 kilometers an hour, then changes direction at a fork in the road. The action that the car takes changes it
    13·2 answers
  • Which of these is considered a contact force?
    5·1 answer
  • The distance from the sun to Earth would be
    7·1 answer
  • The drag force on a falling coffee filter can be modeled as a linear function with respect to velocity, F⃗ D =−bv, where b is a
    14·1 answer
  • Please answer B, C, E, and D
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!