Physics : asked on pamisueparke
 08.04.2021

Aball starts from rest. it rolls down a ramp and reaches the ground after 4 seconds. its final velocity when it reaches the ground is 7.0 meters/second. the initial velocity of the ball is meters/second, and its acceleration is meters/second2. nextreset

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24.05.2023, solved by verified expert
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8 students found this answer . helpful
If it starts at rest the initial velocity is 0.
For an acceleration, a, and time, t, the velocity is v=at. Since at t=4, v=7, then a=7/4=1.75m/s^2
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P Answered by Studen AI
From the problem, it's stated that the ball starts from rest. The term "rest" means there's no initial motion. Therefore, the initial velocity of the ball is 0 meters/second.

Acceleration, often denoted by 'a', is a vector quantity that specifies the rate of change of velocity — how much the speed OR direction of an object changes per unit of time.

We're told that the final velocity, v, is 7.0 m/s and the object reaches this velocity after a duration, t, of 4 seconds.

To calculate acceleration, we can use the first equation of motion which is:

v = u + at

- 'v' is the final velocity
- 'u' is the initial velocity
- 'a' is the acceleration
- 't' is the time

Rearranging for acceleration (a), we get:

a = (v - u) / t

Substituting the given values, we have:

a = (7.0 m/s - 0 m/s) / 4 s

a = 7.0 m/s² / 4

a = 1.75 m/s²

So, the acceleration is 1.75 m/s².

Therefore, the sentence should read:

The initial velocity of the ball is 0 meters/second, and its acceleration is 1.75 meters/second².
Physics
Step-by-step answer
P Answered by PhD

If it starts at rest the initial velocity is 0.

For an acceleration, a, and time, t, the velocity is v=at. Since at t=4, v=7, then a=7/4=1.75m/s^2

Physics
Step-by-step answer
P Answered by PhD
If it starts at rest the initial velocity is 0.
For an acceleration, a, and time, t, the velocity is v=at. Since at t=4, v=7, then a=7/4=1.75m/s^2
Physics
Step-by-step answer
P Answered by Specialist
Options:
a. a lower frequency and a shorter wavelength.
b. a higher frequency and a longer wavelength.
c. a lower frequency and a longer wavelength.
d. a higher frequency and a shorter wavelength

Answer:
d. a higher frequency and a shorter wavelength

Explanation:
The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. Light waves have very, very short wavelengths.
For example, Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.
Options:
a. a lower frequency and a shorter wavelength.
b. a higher frequency and a longer wavelen
Physics
Step-by-step answer
P Answered by Specialist
Answer: Option B and C are True.

Explanation:
The weight of the two blocks acts downwards.
Let the weight of the two blocks be W. Solving for T₁ and T₂:
w = T₁/cos 60° -----(1);
w = T₂/cos 30° ----(2);
equating (1) and (2)
T₁/cos 60° = T₂/cos 30°;
T₁ cos 30° = T₂ cos 60°;
T₂/T₁ = cos 30°/cos 60°;
T₂/T₁ =1.73.
Therefore, option a is false since T₂ > T₁.
Option B is true since T₁ cos 30° = T₂ cos 60°.
Option C is true because the T₃ is due to the weight of the two blocks while T₄ is only due to one block.
Option D is wrong because T₁ + T₂ > T₃ by simple summation of the two forces, except by vector addition.
Answer: Option B and C are True.

Explanation:  
The weight of the two blocks acts downwards.
Le
Physics
Step-by-step answer
P Answered by PhD

Answer:

9.6 meters

Step-by-step explanation:

Time taken by the tomatoes to each the ground

using h = 1/2 g t^2 

t^2 = 2h/g = 2 x 50/ 9.8 = 10.2

t = 3.2 sec 

horizontal ditance = speed x time = 3 x 3.2 = 9.6 meters

Physics
Step-by-step answer
P Answered by PhD

The question specifies the diameter of the screw, therefore the IMA of this screw is 0.812? / 0.318 = 8.02

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