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dybincka [34]
4 years ago
9

A girl on a bridge throws a rock

Physics
1 answer:
Anon25 [30]4 years ago
6 0

t = 1.3 s.

To solve this exercise we have to use the freefall equation t = (v-v₀)/g. v = 0 due the final velocity when the rock reach the ground is 0.

With v₀ = -12.5m/s and g = 9.8m/s²

t = -(-12.5m/s)/9.8m/s²

t = 1.3 s

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I need an answer for 1 and 2 pleaseeee
NemiM [27]

Answer:

I'm not sure, its either 1 or 2

Explanation:

Water melts ice because it is at a higher temperature than the ice, so heat energy is transferred from the water to the ice. Since the scientific principle at work here is the idea of heat transfer, it is not necessary that water be used to melt ice.

7 0
4 years ago
La distancia entre dos ciudades es de 350km.Si un autocar emplea 4h en el viaje,determina su velocidad media y exprésala.En el s
Oxana [17]

Answer:

v = 87.5 km/h

Explanation:

To find the speed of the car you use the following formula:

v=\frac{x}{t}   (1)

x: distance traveled by the car  = 350km

t: time = 4h

you replace the values of x and t in the equation (1):

v=\frac{x}{t}=\frac{350km}{4h}=87.5\frac{km}{h}

hence, the speed of the car is 87.5km/h

4 0
3 years ago
Which electromagnetic waves have the shortest wavelength and the highest frequency?
ra1l [238]
It’s supposed to be gamma, what are your other options
5 0
3 years ago
A Scooter with a mass of 50 kilograms travels with a speed of 10 meters per second. A 2 Nt force bring it to a halt. How long ti
Serga [27]

Answer:

250s

Explanation:

Given parameters:

Mass  = 50kg

Speed  = 10m/s

Force  = 2N

Unknown:

Time the force was acting  = ?

Solution:

To solve this problem, we use the equation of motion from the second law of Newton:

            Ft  = mV

F is the force

t is the time taken

m is the mass

V is the velocity

          2  x t  = 50 x 10

               t  = 250s

3 0
3 years ago
Studies of the relationship of the Sun to our galaxy-the Milky Way-have revealed that the Sun is located near the outer edge of
lianna [129]

Mass of the milkyway galaxy :

M_{mw} = \frac{4\pi ^{2}r^{3}}{GT^{2}}\\\\M_{mw} = \frac{4\pi ^{2}(3x10^{4}x9.46x10^{15})^{3}}{6.67x10^{-11}Nm^{2}/Kg^{2}x(7.13x10^{15})^2}\\\\M_{mw } =  2.7x10^{14} Kg

The magnitude of the mass of the Milky Way galaxy = 2.7x10^{14} Kg

<h3>Can galaxies recycle stars?</h3>

Galaxies do not appear to have sufficient matter inside them to keep shaping modern stars at the rates that they do. Presently, astronomers have caught a universe within the act of reusing fabric that it already tossed out, which may clarify the discrepancy. New perceptions give the primary coordinate evidence of gas streaming into distant galaxies that are effectively making infant stars, offering support for the "galactic recycling" theory.

To learn more about galactic recycling, visit;

brainly.com/question/6272572

#SPJ4

6 0
2 years ago
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