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svetoff [14.1K]
3 years ago
7

A bus decreases its speed

Physics
1 answer:
eduard3 years ago
7 0

Answer:

-6 km/h per minute

Explanation:

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Jumping up before the elevator hits. After the cable snaps and the safety system fails, an elevator cab free-falls from a height
butalik [34]

Answer:

a) I = -2257.6 Kg*m/s

b) F = -451,520N

Explanation:

part a.

we know that:

I = P_f-P_i

where I is the impulse, P_f the final momentum and P_i the initial momentum.

so:

I = MV_f-MV_i

where M is the mass, V_f the final velocity and V_i the initial velocity.

Therefore, we have to find the initial velocity or the velocity of the passenger just before the collition.

now, we will use the law of the conservation of energy:

E_i=E_f

so:

mgh = \frac{1}{2}MV_i^2

where g is the gravity and h the altitude. So, replacing values, we get:

(85kg)(9.8m/s^2)(36m)= \frac{1}{2}(85kg)V_i^2

solving for V_i:

V_i = 26.56m/s

Then, replacing in the initial equation:

I = MV_f-MV_i

I = (85kg)(0m/s)-(85kg)(26.56m/s)

I = -2257.6 Kg*m/s

Then, the impulse is -2257.6 Kg*m/s, it is negative because it is upwards.

part b.

we know that:

Ft = I

where F is the average force, t is the time and I is the impulse. So, replacing values, we get:

F(0,005s) = -2257.6 Kg*m/s

solving for F:

F = -451520N

Finally, the force is -451,520N, it is negative because it is upwards.

3 0
3 years ago
Star temperature is indicated by?
astraxan [27]
A star's temperature is most likely indicated by the color of it. The hotter the star, the bluer it is. The colder the star, the redder it is. 
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3 years ago
A 6V radio with a current of 2A is turned on for 5 minutes. Calculate the energy transferred in joules
iogann1982 [59]

Answer:

R=V/I=6/2=3ohm

time =5minutes =5*60=300seconds

I=2A

Heat =I^2Rt=(2)^2*3*300=4*900=3600J

7 0
2 years ago
a rock is dropped from a height of 80 m and is in free fall what is the velocity of as it reaches the ground 4.0 seconds later
Marta_Voda [28]
Velocity = displacement (distance)/time

v=80m/4s

v=20m/s

velocity = 20 meters per second
8 0
3 years ago
Un móvil se desplaza con una rapidez inicial de 100 km/h, se le aplican los frenos con una
KIM [24]

Answer:

in English please I am quite puzzled

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3 years ago
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