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zlopas [31]
2 years ago
5

If two people are running at the same speed in the same direction. One person is one meter ahead of the other. The person in fro

nt throws a ball to the person slightly behind. As seen by an observer at rest on the ground, is it possible that the ball looks as if it was thrown forward
Physics
1 answer:
Gre4nikov [31]2 years ago
5 0

Answer:yes

Explanation:

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A motorcycle drives up a steeply inclined ramp. The work done on the motorcycle by the earth’s gravitational force is ____.
PilotLPTM [1.2K]
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.
3 0
3 years ago
Read 2 more answers
A compressor delivers 130 scfm of air through a 1-in schedule 40 pipe at a receiver pressure of 105 psig. Find the pressure loss
USPshnik [31]

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:

P_L=\frac{0.1025LQ^2}{3600*CR*d^{5.31}}

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

d^{5.31} = 1.2892

Substituting these values, pressure loss in the pipe becomes

P_L=\frac{0.1025LQ^2}{3600*CR*d^{5.31}} = \frac{0.1025*170*(130)^2}{3600*8.143*1.2892} = 7.792 psig = 22.492 psi

Therefore, the pressure loss in the pipe is 7.792 psig

4 0
3 years ago
A red horse and a black horse raced on a 1-mile long circular racetrack. The red horse
Lyrx [107]

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.

5 0
3 years ago
Read 2 more answers
Why does it take more force to get a resting object to move than it does to keep
Triss [41]

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.

6 0
3 years ago
¿Qué resistencia debe ser conectada en paralelo con una de 20 Ω para hacer una
Lisa [10]

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:

R=\frac{1}{\frac{1}{R_{1} } +\frac{1}{R_{2} } +...+\frac{1}{R_{N} }}

Esto también puede ser expresado como:

\frac{1}{R} =\frac{1}{R_{1} } +\frac{1}{R_{2} } +...+\frac{1}{R_{N} }

Entonces, en este caso sabes:

  • R= 15 Ω
  • R1= 20 Ω
  • R2=?

Reemplazando:

\frac{1}{15} =\frac{1}{20}+\frac{1}{R2}

y resolviendo:

\frac{1}{R2} =\frac{1}{15} -\frac{1}{20}

\frac{1}{R2} =\frac{1}{60}

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>

6 0
3 years ago
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