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finlep [7]
4 years ago
10

A 1200 kg car accelerates from 0 m/s to 25 m/s in 10 seconds. how much work was done on the car by the net force?

Physics
1 answer:
Blizzard [7]4 years ago
5 0
Are there any answer choices

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A large cube (mass = 25 kg) being accelerated across a horizontal frictionless surface by a horizontal force . A small cube mass
belka [17]

Answer:F=400.28 N

Explanation:

Given

mass of large cube M=25 kg

mass of small cube m=4 kg

coefficient of static friction \mu =0.71

acceleration a of the system is given by

F=(M+m)a

a=\frac{F}{M+m}

Now Normal reaction between two blocks is given by

N=ma

friction tries to balance weight

thus f_r=mg

and f_r=\mu N

f_r=\mu ma

\mu ma=mg

\mu \frac{F}{M+m}=g

F=\frac{(M+m)g}{\mu }

F=\frac{29\times 9.8}{0.71}

F=400.28 N

7 0
3 years ago
How do I use a metric conversions chart
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4 0
4 years ago
Una pelota se desliza hacia arriba por una pendiente se halla inicialmente a 6m de la parte más baja de dicha pendiente y tiene
jolli1 [7]

Answer:

a) vprom = - 0.6 [m/s] b) ver explicacion c) vf = 10.8 [m/s]

Explanation:

Para poder solucionar este problema debemos completar el enunciado del problema así como la pregunta, realizando una búsqueda en Internet encontramos el enunciado completo, así como la pregunta.

"Una pelota que se desliza hacia arriba por una pendiente se halla inicialmente a 6 m de la parte más baja de dicha pendiente y tiene una velocidad de 4 m/s. Cinco segundos después se encuentra a 3 m de la parte más baja. Si suponemos una aceleración constante, "

¿cual fue la velocidad media?

¿Cuál es el significado de una velocidad media negativa?

¿Cuáles son la aceleración media y la velocidad final?

Para facilitar esta solución debemos realizar un esquema del movimiento de la pelota en el plano inclinado. En la imagen adjunta se puede ver un esquema del movimiento de la pelota sobre el plano inclinado en los diferentes tiempos mencionados.

<u>¿cual fue la velocidad media?</u>

<u />

La velocidad media se debe calcular utilizando la expresión de velocidad = espacio / tiempo.

v_{prom}=x/t\\v_{prom}=(3-6)/5\\v_{prom}=-0.6 [m/s]

<u>¿Cuál es el significado de una velocidad media negativa? </u>

La velocidad media negativa significa que se dirige hacia abajo en sentido contrario

<u>¿Cuáles son la aceleración media y la velocidad final?</u>

<u />

x=v_{o}*t+0.5*a*t^{2} \\-3=(4)*(5)+0.5*a*(5)^2\\a=1.36[m/s^2]\\\\Velocity\\v_{f}=v_{o}+a*t = 4+(1.36*5)\\v_{f}=10.8[m/s]

6 0
3 years ago
The fire alarm goes off, and a 75 kg firefighter slides down a pole with a constant acceleration of a = 6 m/s square. What is th
Alex17521 [72]

Answer:

450N

Explanation:

Given data

Mass m= 75kg

Acceleration= 6m/s^2

From the Newtons first law, F=ma

substitute

F=75*6

F= 450N

Hence the force is 450N

3 0
3 years ago
Sam has been working to improve his muscular fitness. He jumps rope and trains with weights. What will most likely be the result
const2013 [10]
Increased Bone Density
4 0
4 years ago
Read 2 more answers
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