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NikAS [45]
2 years ago
15

During a race, a sprinter accelerated 1.8 m/s 2 in 2.5 seconds.How many meters per second did the sprint increase with this amou

nt of acceleration
Physics
1 answer:
trasher [3.6K]2 years ago
3 0

During a race, a sprinter accelerated 1.8 m/s 2 in 2.5 seconds. The sprint increase with this amount of acceleration by 4.5 m/s.

<h3>What is acceleration?</h3>

Acceleration is the time rate of change of velocity.

Acceleration a = velocity v / time t

1.8 = v/2.5

v = 4.5 m/s

The sprint increase with this amount of acceleration by 4.5 m/s.

Learn more about acceleration.

brainly.com/question/12550364

#SPJ1

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Which of the following forms of energy must an object have if it is moving at a constant velocity?
lbvjy [14]

Answer:

Kinetic energy

Explanation:

5 0
3 years ago
What is the kinetic energy of the silver sphere at the moment it hits the ground? (Assume that energy is conserved during the fa
lesya [120]

Answer:

Kinetic Energy = 0

Explanation:

No matter if energy is totally conserved during the fall or when it hits the ground, the kinetic energy of the silver sphere will be zero because the velocity component in K.E = 1/2mv^{2} becomes zero, the over all energy becomes zero.

4 0
3 years ago
Help with 2 Physics questions, WILL CHOOSE BRAINLIEST
Tju [1.3M]

1) D

2) D.) Greater than \theta_c

Explanation:

1)

The phenomenon of total internal reflection occurs when a ray of light hitting the interface between two mediums is totally reflected back into the original medium, therefore no refraction into the second medium occurs.

This phenomenon occurs only if two conditions are satisfied:

  • The index of refraction of the first medium is larger than the index of refraction of the 2nd medium
  • The angle of incidence is greater than a certain angle called critical angle

In picture 1, we have 4 different diagrams. In the diagrams:

  • The red arrow represents the incident ray
  • The green arrow represents the refracted ray
  • The blue arrow represents the reflected ray

Total internal reflection occurs when there is no refraction, therefore when there is no green arrow: this occurs only in figure D, so this is the correct option. (in figure C, there is a refracted ray but it is parallel to the interface: this condition occurs when the angle of incidence is exactly equal to the critical angle, however in this problem, the angle of incidence is greater than the critical angle, so the correct option is D)

2)

As we stated in problem 1), total internal reflection occurs when the angle of incidence is equal or greater than the critical angle. Therefore in this case, the angle of incidence must be

D.) Greater than \theta_c

3 0
3 years ago
Harry and Hagrid needed to get money out of Gringotts bank. The bank cart was accelerating at a rate of 4 m/s2 and it had a mass
Nutka1998 [239]

a = acceleration of the bank cart = 4 m/s²

m = mass of the bank cart = 8000 kg

F = net force on the cart

According to newton's second law , Net force is the product of mass of the object and the acceleration of the object.

Net force = mass x net acceleration

hence Net force acting on the cart is given as

F = ma

F = 8000 x 4

F = 32000 N

hence the net force acting on the cart comes out to be 32000 N


8 0
3 years ago
How do the conditions in tube c prevent air reaching the iron nail​
lina2011 [118]

Answer:

The conditions stop air from getting to the nail is the oil

Explanation:

8 0
3 years ago
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