Answer:
D. I stayed up late for several nights. Eventually, I was too tired to concentrate.
Explanation:
i got it right edge 2020.
Answer:
Physics is the natural science that studies matter, its motion and behavior through space and time, and the related entities of energy and force.
Ancient history. Elements of what became physics were drawn primarily from the fields of astronomy, optics, and mechanics, which were methodologically united through the study of geometry. These mathematical disciplines began in antiquity with the Babylonians and with writers such as Archimedes and Ptolemy.
Answer:
The ranking of the waves from the lowest energy wave to the highest energy wave is 1 → 4 → 2 → 3.
Explanation:
- Amplitude is the highest vibrated position of a wave measured from the equilibrium position.
- So the least amplitude for wave 1 is the least energy representation.
- Similarly distance from midpoint to crest or trough is also the measure for the energy level of wave. Crest and trough, both are the maximum amplitude condition of the wave.
- So 12 cm being the highest represents the highest energy level i.e wave 3.
Answer:
A. 243 N
Explanation:
Friction is the force that opposes the relative motion between systems that are in contact.
This friction force that opposes the motion of the oak chest across the oak surface will be equal and opposite to that exerted by the woman.
First find the normal force which is the force that would point directly upwards to support weight of the block.
Normal force, N= mg where m is the mass of the chest and g is the acceleration due to gravity.
Given m=40 kg and g=9.80 m/s²
N force=40×9.80 =392N
Then find the force of friction which is given by the formula;
<em>F=μN where μ is friction coefficient for the oak chest and N is the normal force on the chest</em>
Given <em>μ</em>=0.620 and N force = 392 N then it will be;
F=0.620× 392 =243.04 N
Answer : 243 N