3 years ago

What is one main difference between animal cells and plant cells?

Physics

1 answer:

vekshin13 years ago

7 0

Answer:

No cell wall

Explanation:

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A seesaw pivots as shown in below. What is the net torque about the pivot point?

rodikova [14]

Answer:

2.3 Nm clockwise

Explanation:

Take counterclockwise to be positive and clockwise to be negative.

∑τ = (3 N) (2.5 m) − (7 N) (1.4 m)

∑τ = 7.5 Nm − 9.8 Nm

∑τ = -2.3 Nm

The net torque is 2.3 Nm clockwise.

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4 years ago

A man, facing a high wall, notices that an echo is heard 4.0 seconds after he makes a sharp sound. After walking 200m directly t

cestrela7 [59]

Answer:2.4

Explanation:basically 2.4 = 2.500 kg and then we add 3.4 seconds in all of them 4.0 + 3.4 = 2.5 ok

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3 years ago

Johannes Kepler used math to show that the planets move in perfect circles around the sun.

svet-max [94.6K]

Kepler actually showed that the planets move around the sun in ellipses, not circles. So the answer is false.

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3 years ago

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A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 3

aleksklad [387]

Answer:

$F_N=1194.24\ N$

Explanation:

Given that,

The elevator is moving up and slowing down at the rate of, $a=3\ m/s^2$

The acceleration due to gravity, $g=9.8\ m/s^2$

Mass of the person, m = 93.3 kg

To find,

The reading of the scale.

Solution,

As the elevator is moving down with some acceleration. The net force acting on it is given by :

$F_N=ma+mg$

$F_N=m(a+g)$

$F_N=93.3(3+9.8)$

$F_N=1194.24\ N$

So, the scale will read 1194.24 N.

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4 years ago

The question is shown on the image

Viktor [21]

Answer:

no idea. i thought i meant to click on a diff one

6 0

3 years ago