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3 years ago

PLEASE HELP LINE GRAPH-SCIENCE

Physics

2 answers:

Bond [772]3 years ago

8 0

Answer:

C is correct

Explanation:

Please give brainliest :)

stiks02 [169]3 years ago

7 0

Answer:

B??

Explanation:

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Canadian Olivia Oliver broke the Guinness World Record for the fastest spin on ice skates on January 2015 with an angular veloci

Shalnov [3]

Answer:

a) 2.63 : 1

b) 143.13 rpm

Explanation:

initial angular velocity ω' = 130 rpm

final angular velocity ω = 342 rpm

recall that angular momentum = ωI

where I is the moment of inertia.

for the initial spinning condition, we take moment of inertial = I'

for final spinning condition, we take moment of inertia = I

initial angular momentum = ω'I' = 130 I'

final angular momentum = ωI = 342 I

according to conservation of angular momentum, initial angular momentum must be equal to the final angular momentum, therefore

342 I = 130 I'

ratio of initial moment of inertia to final moment of inertia = I'/I

==> I'/I = 342/130 ≅ 2.63 : 1

b) to achieve a final angular velocity of of 375 rpm, her initial velocity will have to be

2.63 = 375/ω'

ω' = 375/2.63 = 143.13 rpm

6 0

3 years ago

A ball is thrown horizontally from the top of a building 54 m high. The ball strikes the ground at a point 35 m horizontally awa

Ivanshal [37]

Answer:

V=34.2 m/s

Explanation:

Given that

Height , h= 54 m

Horizontal distance , x = 35 m

Given that , the ball is thrown horizontally , therefore the initial vertical velocity will be zero.

In vertical direction :

We know that

$V^2_y=U^2_y+2 g h$

Now by putting the values in the above equation we got

$V^2_y=U^2_y+2 g h$

$V^2_y=0^2+2\times 9.81 \times 54$

Assume $g= 9.81 m/s^2$

Thus

$V^2_y=1059.48$

$V_y=\sqrt{1059.48}\ m/s$

$V_y=32.54 m/s$

We also know that

$V_y=U_y+ g\times t$

$32.54=9.81\times t$

$t=\dfrac{32.54}{9.81}=3.31\ s$

In horizontal direction :

$x=U_x\times t$

$U_x=\dfrac{35}{3.31}=10.54\ m/s$

Thus the resultant velocity

$V=\sqrt{V^2_y+U^2_x}$

$V=\sqrt{32.54^2+10.54^2}=34.2\ m/s$

V=34.2 m/s

Therefore the velocity will be 34.2 m/s.

5 0

4 years ago

Does a light switch have electrical potential energy or mechanical energy

nordsb [41]

Turning on a light switch converts mechanical energy to electrical and radiant energy. So Mechanical energy

7 0

4 years ago

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. A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 30.0 m

love history [14]

Total distance covered = 40+20+30 = 90 km

Total time taken to cover this distance = .5 hr + .2 hr + .75 hr = 1.75 hr

Avg. speed of Trip would be
90/1.45 = 62.07 km

7 0

3 years ago

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DLANAS

andriy [413]

Answer:

Se llama ángulo de incidencia -i- el formado por el rayo incidente y la normal. La normal es una recta imaginaria perpendicular a la superficie de separación de los dos medios en el punto de contacto del rayo. El ángulo de reflexión -r- es el formado por el rayo reflejado y la normal.

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4 years ago