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natita [175]
3 years ago
9

Which of the following statements correctly describes the role that friction plays in the motion of a train? *

Physics
2 answers:
Anna007 [38]3 years ago
8 0
C. FRICTION IS NECESSARY TO KEEP THE TRAIN ON THE TRACK AS IT IS MOVING
Lesechka [4]3 years ago
7 0

Answer:

Should be D!

Explanation:

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Physics approach to study macromoelcues at nanoscales <br> in detail plx
erastova [34]

Answer:

Abstracto

Los ácidos nucleicos y las proteínas comprenden una red de biomacromoléculas que almacenan y transmiten información que sustenta la vida de la célula. El estudio de estos mecanismos es un campo llamado biología molecular. El desarrollo de esta ciencia siempre ha ido acompañado de avances técnicos que permiten romper barreras metodológicas para probar hipótesis novedosas. Entre los métodos disponibles para los biólogos moleculares, destacan cinco: electroforesis, secuenciación, clonación, transferencia y reacción en cadena de la polimerasa. Su impacto llega a la genética, la medicina y la biotecnología. Aquí, se revisan la relevancia histórica, los fundamentos técnicos y las tendencias actuales de estos cinco métodos esenciales. La revisión pretende ser útil tanto para estudiantes como para científicos profesionales que buscan adquirir conocimientos avanzados sobre el valor de estos métodos para investigar los mecanismos moleculares que sostienen la vida.

8 0
2 years ago
What is the direction of the net force that acts on an object undergoing uniform circular motion?
valentinak56 [21]

Answer B. the direction of force is the same

7 0
3 years ago
Will give brainliest to correct answer.
Darina [25.2K]

Answer:

1.5X10^-4C

Explanation:

Expression for the electric force between the two charges is given by -

F = (k*q1*q2) / r^2

Here, k = constant = 9 x 10^9 N*m^2 / C^2

q1 = unknown

F=25N

q2 = 1.9x10^-6 C

r = 0.32 m

Substitute the given values in the above expression -

25=9x10^9 *(q1) * 1.9 x10^ -6/ (0.32m)^2

25= 17,100* (q1)/ 0.1024

multiply both sides by 0.1024 to get rid of the denominator

2.56=17,100*(q1)

Divide both sides by 17,100 to isolate q1

q1=1.5x10^-4C

4 0
3 years ago
A pitcher claims he can throw a 0.148-kg baseball with as much momentum as a 2.00-g bullet moving with a speed of 1.50 ✕ 103 m/s
Svetlanka [38]
(a) The mass of the bullet is m_b = 2.00g=0.002 kg and its speed is v_b = 1.5 \cdot 10^3 m/s, so its momentum is
p=m_b v_b = (0.002 kg)(1.5 \cdot 10^3 m/s)=3 kg m/s

The pitcher claims that he can throw the ball with the same momentum p of the ball. Since the mass of the ball is m=0.148 kg, this means that the velocity of the ball must be:
v= \frac{p}{m}= \frac{3 kg m/s}{0.148 kg}=20.3 m/s

(b) The kinetic energy of the bullet is:
K_b =  \frac{1}{2} m_b v_b^2= \frac{1}{2}(0.002 kg)(1.5 \cdot 10^3 m/s)^2=2250 J

while the kinetic energy of the ball is:
K= \frac{1}{2}mv^2= \frac{1}{2}(0.148 kg)(20.3 m/s)^2=30.5 J

So, the bullet has greater kinetic energy than the ball.
4 0
2 years ago
Which of the following could be included in your gamer's creed that would help keep gamers safe?
Nesterboy [21]

Answer:

The answer is B. I will use privacy features that gaming sites provide to ensure I do not share personal information with strangers.

Explanation:

It keeps you safe online

8 0
3 years ago
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