Answer:
Explanation:
According to the work-energy theorem, the work done on the car is equal to its variation of kinetic energy:
where
m = 1900 kg is the mass of the car
vf = 15 m/s is the final speed
vi = 25 m/s is the initial speed
Substituting the data, we find
and the work is negative because it is done against the motion of the car (in fact, the car slows down, so it loses kinetic energy).
Answer:
-2200 N
Explanation:
Here we can use the impulse theorem, which states that the impulse exerted on Sarah (product of force and duration of collision) is equal to Sarah's change in momentum:
where
F is the average force
is the duration of the collision
m is the mass
is the change in velocity
In this problem:
m = 55 kg
Solving the formula, we find the force exerted by the seatbelt on Sarah:
And the negative sign means the direction is opposite to that of Sarah's initial motion.
Answer:
18 grams
Explanation:
The mass of an object is the object's fundamental property. It is the amount or quantity of mater in the object. Irrespective of the object's location or the gravitational force applied on the object, the mass of an object remains the same. In other words, the mass of an object is the same everywhere.
The mass should however not be confused with its weight which depends on the mass and the gravitational force applied on it.
In summary, whether on earth or in the moon, the mass of an object remains the same. If the mass of the object is 18 grams on earth, it will also be 18 grams in the moon.
answer 8N 8N
la tensión del ladrillo inferior es 8N ya que los ladrillos son idénticos, decido 24 por 3 para darme 8
la tensión entre el ladrillo superior y el medio también es 8N
Answer:
If we have large numbers (b is positive) or small numbers (b is negative), then this way ... 1, and V2i = 100 L, n2i = 5 + 2 + 1 = 8 in vessel 2. ... a good working substance in the barometer.