Negative - when the motorcycle displacement has a component in the opposite direction of the given force, that force is doing negative work on the motorcycle.
Answer:
The pressure loss in the pipe is 7.792 psig
Explanation:
Given;
flow rate Q = 130 scfm
length of pipeline =170ft
atmospheric pressure = 14.7 psia
pressure in pipe = 105 psig, to psia = 105 + 14.7 = 119.7 psia
Compression ratio (CR) = pressure in pipe/atmospheric pressure
Compression ratio (CR) = 119.7/14.7 = 8.143
Pressure loss in the pipe can be calculated as follows:

from schedule table, 1-in schedule 40 pipe has a diameter d.

Substituting these values, pressure loss in the pipe becomes

Therefore, the pressure loss in the pipe is 7.792 psig
Answer:
Explanation:
B- The red horse's average speed was greater than the black horse's average speed.
Red average speed = 1/120 = 0.00833 mi/s
Black average speed = 1/150 = 0.00667 mi/s
we only know about average speed based on the information given. Either horse could have had higher or lower, even negative, instantaneous speed during some phase of the race.
Answer:
Objects have a natural tendency to resist change. ... Heavier objects (greater mass) resist change more than lighter objects. Example: Pushing a bicycle or a Cadillac, or stopping them once moving. The more massive the object (more inertia) the harder it is to start or stop.
Answer:
La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una resistencia combinada de 15 Ω tiene un valor de 60 Ω
Explanation:
Las resistencias son aquellos dispositivos en los circuitos eléctricos que suelen emplearse para oponerse al paso de la corriente eléctrica.
Se denomina resistencia resultante o equivalente al valor de la resistencia que se obtiene al considerar un conjunto de ellas.
Cuando tenes resistencias en paralelo la corriente se divide y circula por varios caminos.
La resistencia equivalente de un circuito de resistencias en paralelo es igual al recíproco de la suma de los inversos de las resistencias individuales:

Esto también puede ser expresado como:

Entonces, en este caso sabes:
Reemplazando:

y resolviendo:


se obtiene:
R2=60 Ω
<u><em>La resistencia que debe ser conectada en paralelo con una de 20 Ω para hacer una resistencia combinada de 15 Ω tiene un valor de 60 Ω</em></u>