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docker41 [41]
3 years ago
13

What is the velocity of sound in air and vacuum​

Physics
2 answers:
guapka [62]3 years ago
8 0

Answer:

approximately 2.99 × 10⁸ m/s

Free_Kalibri [48]3 years ago
7 0
3.02 x 10^8 m/s. Exact answer. Pls mark me brainliest .
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Electrical Safety: What should you do to a hot plate before turning it on? More than one answer may be correct. Check that the l
solniwko [45]

Answer and Explanation:

Before turning a hot plate on, one should consider these points:

  • Check for the leads and ensure they does not trail in liquid.
  • The cable should be checked for any exposed wire before turning on in order to prevent any shock.
  • Any oil residue should be wiped off of the hot plate to ensure its longevity.
  • It should be placed in a stable place in order to ensure safety against any hazard.
  • Thus all the above mentioned points are correct to ensure safety.
8 0
3 years ago
A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42° . What is the force of static f
olchik [2.2K]

Answer:

Explanation:

The force of static friction acting on the box is the frictional force;

Frictional force Ff = Wsin theta (force acting along the ramp)

W is the gravitational force known as the weight

Ff = 112.1sin42°

Ff = 112.1(0.6691)

Ff = 75.00N

Hence he force of static friction acting on the box  if box has a gravitational force of 112.1 N id 75.00N

4 0
3 years ago
Which contributions did Johannes Kepler make? Check all that apply.
gayaneshka [121]

Answer:

Its 4,5,

Explanation:

7 0
3 years ago
Read 2 more answers
Our galaxy is Spiral, elliptical or irregular?​
Bingel [31]

AnsWER

JANNAH

Explanation:

BECAUSE

5 0
3 years ago
Which explains why a gas does not have a fixed shape?
mafiozo [28]
A gas doesn't have a fixed shape because the amount of space between the molecules in gas can change easily. B. the particles are not compressible
8 0
3 years ago
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