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Tcecarenko [31]
3 years ago
6

What are frames of reference

Physics
2 answers:
Margarita [4]3 years ago
8 0
A set of criteria or stated values in relation to which measurements or judgments can be made :)
Gnoma [55]3 years ago
7 0

Answer:

Reference frame, also called frame of reference, in dynamics, system of graduated lines symbolically attached to a body that serve to describe the position of points relative to the body.

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A small rock is thrown vertically upward with a speed of 27.0 m/s from the edge of the roof of a 21.0-m-tall building. The rock
lbvjy [14]

Answer:

A. 33.77 m/s

B. 6.20 s

Explanation:

Frame of reference:

Gravity g=-9.8 m/s^2; Initial position (roof) y=0; Final Position street y= -21 m

Initial velocity upwards v= 27 m/s

Part A. Using kinematics expression for velocities and distance:

V_{final}^{2}=V_{initial}^{2}+2g(y_{final}-y_{initial})\\V_{f}^{2}=27^{2}-2*9.8(-21-0)=33.77 m/s

Part B. Using Kinematics expression for distance, time and initial velocity

y_{final}=y_{initial}+V_{initial}t+\frac{1}{2} g*t^{2}\\==> -0.5*9.8t^{2}+27t+21=0\\==> t_1 =-0.69 s\\t_2=6.20 s

Since it is a second order equation for time, we solved it with a calculator. We pick the positive solution.

8 0
3 years ago
Force = mass times acceleration
Alona [7]

Yes indeed ! Very good !


3 0
3 years ago
Once a falling has reached a constant velocity, the object
lesya [120]
<span> A. stops accelerating </span>
<span>  B. stops speeding up </span>
<span>  C. experiences equal forces of gravity and air resistance </span>
<span>  D. all of the above</span>

A full lake is dropping at its constant rate, meaning it is unchanging over time.
After 4 weeks’ time, it already dropped 3 feet.
Now, let’s solve for the Unit rate based on the given data.
=> 3 feet in 4 weeks
=> Unit rate is 3 feet per 4 weeks
=> in 4 weeks there are (7 * 4) = 28 days
=> 3 feet / 28 days  
=> the Unit rate is .107 feet / day

3 0
4 years ago
The location(s) an electron can occupy around the nucleus depends on the electron's ____________.
enyata [817]
I think that it is mass?
6 0
3 years ago
Read 2 more answers
What scientific instrument is sensitive enough to detect a planet transiting a star on the Kepler Spacecraft?
siniylev [52]

<h3>SCIENTIFIC INSTRUMENT</h3>

==============================

\large \sf \underline{Question:}

  • What scientific instrument is sensitive enough to detect a planet transiting a star on the Kepler Spacecraft?

==============================

\large \sf \underline{Answer:}

\qquad \qquad\huge \bold {Photometer}

==============================

\large \sf \underline{Explanation:}

  • A photometer is an instrument that measures and quantifies the brightness of a celestial body.

==============================

<h3>Mutual Information:</h3>

  • brainly.com/question/17246738

==============================

6 0
2 years ago
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