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3 years ago

Need help on question b

Physics

1 answer:

ZanzabumX [31]3 years ago

8 0

The answer is A.

A positive charge’s electric field pushes out.

Hope this helps! -Avenging

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A car is moving with a speed of 15 ms. How long does it take to cover a distance of 1.2 km?

fgiga [73]

Answer: 80 s

Explanation:

Speed is expressed in v= d/t, derive the equation so we can have time.

First conert km into meters to cancel out both units and only seconds will remain.

1.2 km x 1000m/ 1km = 1200 m

t = 1200 m /15 m/s = 80 s

8 0

3 years ago

Radiation measured in emissions/sec is called the curie. a. True b. False

iragen [17]

True is the correct anwser

3 0

3 years ago

A car speeds up from 13 m/s to 23 m/s in 30 seconds. What is the acceleration of the car?

ra1l [238]

Well, v = u + a×t is the equation.

v: final velocity, which is 23 m/s in this equation.
u: initialo velocity = 13 m/s 
a: acceleration = ? 
t: time = 30s

Your equation would be...

23 = 13 + a×30 
a = (23 - 13) / 30 
a = 1 / 3 
a = 0.333 m/s

7 0

3 years ago

A ladybug sits at the outer edge of a turntable, and a gentleman bug sits halfway between her and the axis of rotation. The turn

Cerrena [4.2K]

Answer:

e. Not enough information to determine

Explanation:

This question is incomplete. Here is the complete question with my solution afterwards;

A ladybug sits at the outer edge of a turntable, and a gentleman bug sits halfway between her and the axis of rotation. The turntable (initially at rest) begins to rotate with its rate of rotation constantly increasing.

What is the first event that will occur?(Assume non-zero frictional force and the same coefficients of friction for both bugs.)

a. The ladybug begins to slide

b. The gentleman bug begins to slide

c. Both bugs begin to slide at the same time

d. Nothing ever happens

e. Not enough information to determine

The centripetal force acting on a rotating body or bugs can be written as,

$F=mrw^2$

$m=$ mass of the corresponding bugs

$r=$ corresponding radial distance of each bug

$w=$ angular speed of the turntable

The centripetal force tries to slide the bugs in an outward direction and it is directly proportional to the products of its mass and radial distance from the axis of rotation of the turntable

$F$ ∝ $mr$

Since the radial distance from the axis of rotation of the turntable for each bug is given, but the mass is not given, the given information is therefore not enough to determine which bugs will slide first.

Option "e" is correct.

7 0

3 years ago

Read 2 more answers

A solid spherical ball and a hollow spherical ball made out of the same material are released from rest at the top of a ramp. Th

ziro4ka [17]

Answer:

1 ) Distribution of mass within the ball

2 ) Height of the ramp

Explanation:

Acceleration of a rolling body down an inclined plane is given by the following formula

a = g sinθ / ( 1 + k² / R² )

k is radius of gyration , R is radius of the spherical object ,

when acceleration is more , velocity will also be more .

for objects in which masses are lying in the periphery like in hollow sphere , the value of k²/R² will be high so denominator of the expression will be high so acceleration will be less , hence velocity on reaching the bottom will be less.

On mass of the ball , velocity will not depend .

If height is increased , ball will have acceleration for greater time so velocity will be high.

On radius it will not depend because , radius r and k increases proportionately.

7 0

4 years ago