A distance-time graph indicates that an object travels 2 m in 2 s and then travels another 80 m during the next 40 s. What is th
1 answer:
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Answer:
a) The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car with uniform velocity is 100 meters.
Explanation:
a) Calculate the uniform velocity travelled by the car:
The uniform velocity is the final velocity (), in meters per second, of the the uniform accelerated stage:
(1)
Where:
- Initial velocity, in meters per second.
- Acceleration, in meters per square second.
- Time, in seconds.
If we know that ,
and
, then the uniform velocity is:
The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car (), in meters, with uniform velocity is calculated by the following kinematic expression:
(2)
If we know that and
, then the distance travelled is:
The distance travelled by the car with uniform velocity is 100 meters.
Answer:
Su padre necesita aplicar una fuerza de 20 newtons en la misma dirección que la fuerza aplicada por su hija.
Explanation:
Asúmase que el baúl se mueve en una superficie horizontal. La fuerza de rozamiento dada por el problema es la fuerza de rozamiento estático máximo, se requiere una fuerza externa antiparalela a la fuerza de rozamiento estático máximo para que el baúl se empiece a mover. La ecuación de equilibrio de fuerzas horizontales sobre el baúl es:
Donde:
- Fuerza externa aplicada sobre el baúl, medida en newtons.
- Fuerza de rozamiento estático máximo, medida en newtons.
Se despeja la fuerza externa:
Si , entonces:
Si la niña solo logra ejercer una fuerza de 30 newtons, su padre necesita aplicar una fuerza de 20 newtons paralela a aquella fuerza.