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3 years ago

12

Cattle are likely to become highly agitated when separated from their herdmates.

1 answer:

Nataly [62]3 years ago

3 0

Answer:

true

Explanation:

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A TV set shoots out a beam of electrons. The beam current is 10A. How many electrons strike the TV screen in a minute.

Wittaler [7]

Answer:

600 mC

Explanation:

The charge of an electron is 1.6 x 10-19C so for a current with 10 mA, the charge going to screen in one second is 10 mC

so number of electrons, n = (10 x 10-3)/(1.6 x 10-19) = 6.25 x 1016 so in a minute the charge is 10 * 60 = 600 mC

4 0

3 years ago

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A leaky 10-kg bucket is lifted from the ground to a height of 14 m at a constant speed with a rope that weighs 0.5 kg/m. Initial

Lina20 [59]

solution:

Weight of bucket = 10kg

Length or distance =14m

Weight of rope=0.5kg/m

At any point x of the rope,

=(0.5)(14-x)

=(7-0.5x)

Since the water finishes draining at 14m level and total weight of water is 42kg

Total mass=(7-0.5x)+(42-3x)+10=(59-3.5x)kg

Force=(9.8)(59-3.5x)

$work w =\lim_{n \to \infty }\sum_{i \to 1}^{n}(9.8)(59-3.5x)\Delta x\\=\int_{0}^{14}(9.8)(59-3.5x)dx\\=9.8\int_{0}^{14}(59-3.5x)dx\\9.8((59x-\frac{3.5x^2}{2})){_{0}}^{14}\\9.8(59(14)-\frac{3.5(14)^2}{2})\\=4733.4\\therefore,\\W=4733.4J\approx 4733J$

5 0

3 years ago

An ore car of mass 35000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 17 m lower vert

BaLLatris [955]

Answer:

Explanation:

Given

mass of car $m=35,000 kg$

Vertical displacement $h=17 m$

spring constant $k=5.3\times 10^5 N/m$

Considering we need to find out compression in the spring when it reaches to ground

Here Gravitational potential Energy is converted to kinetic energy which finally converts to Elastic Potential Energy

suppose x is the compression in spring

Potential Energy=mgh

Elastic potential energy $=\frac{1}{2}kx^2$

$35000\times 10\times 17=0.5\times 5.3\times 10^5\times x^2$

$x=4.73 m$

7 0

3 years ago

What acceleration would a 18 kg box have if we pushed it with a force of 250 N across a surface that

konstantin123 [22]

Answer:

$a=0.08\ m/s^2$

Explanation:

Given that,

Mass of a box, m = 18 kg

It is pushed with a force of 250 N

The coefficient of friction is 0.8

We need to find the acceleration of the box.

Normal force acting on the box,

N = mg

M = 18 × 10

N = 180 N

The force acting on the force in terms of coefficient of friction is given by :

$F=\mu mg\\\\\text{or}\\\\ ma=\mu mg\\\\a=\dfrac{\mu }{g}\\\\a=\dfrac{0.8}{10}\\\\a=0.08\ m/s^2$

So, the acceleration of the box is $0.08\ m/s^2$

3 0

4 years ago

Earth's size and composition led to volcanic activity, which, in turn, had a major impact on Earth's _____.

LiRa [457]

<span>Earth's size and composition led to volcanic activity, which, in turn, had a major impact on Earth's "Atmosphere"

Hope this helps!</span>

6 0

3 years ago

Read 2 more answers