3 years ago

Which line represents travel at the fastest speed?

1 answer:

5 0

There is no lines that we can see. Also the rate of something has the biggest number or its either gonna be the longest line, yw .

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A snowboarder starts from rest on an inclined planar snow surface and gives herself a tiny push to start sliding down the hill.

tiny-mole [99]

Answer:

v = 26.52 m/s

Explanation:

Here we know that as she passes the flag she will gain some speed

so here we can say that

Work done by all forces = change in kinetic energy of the system

so we will have

$W_g + W_f = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$

here we know that

$W_g = mgh$

$W_f = -\mu mg d$

$v_i = 0$

h = 39.78 m

d = 27.81 m

so we have

$mgh - \mu mg d = \frac{1}{2}mv^2 - 0$

$(9.8)(39.78 - (0.14)(27.81)) = \frac{1}{2} v^2$

$v = 26.52 m/s$

8 0

3 years ago

An object moves with constant acceleration 3.45 m/s2 and over a time interval reaches a final velocity of 14.0 m/s.

Sav [38]

Assuming the object was originally at rest, it must have been traveling for
14.0/3.45 = 4.06 seconds

4 0

3 years ago

19. The current in a hair dryer is 12 A. The hair dryer is plugged into a 120-V outlet. How

patriot [66]

Answer:

10 ohms

Explanation:

R = V / I

3 0

3 years ago

Which of the following actions will keep the gravitational force between two objects unchanged?

Lady bird [3.3K]

Answer:

increasing the temperature of the object

8 0

3 years ago

Explain how fossil fuels are turned into useful forms of energy ?

jekas [21]

Fossil fuels like coal for instance , when they are provided with heat energy (heating them) they start producing Kinetic energy . This kinetic energy will be passed along a turbine which transforms this K.E to an electrical energy used in different useful forms.

5 0

4 years ago