In the early 1600s, Galileo Galilei performed a series of experiments to measure the acceleration of a ball rolling down a smooth inclined plane. He tried several ways to measure time, including water clocks and his own pulse. Suppose his pulse rate was 66 beats per minute, and he counted 11 beats for the ball to roll down the plane. How many seconds was the ball rolling?

Answer:

when they have the same slope

Answer:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.

Explanation:

Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.

Hope this helps :)

Answer:

On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. Traditionally, the coaster cars are pulled up the first hill by a chain; as the cars climb, they gain potential energy.

Mechanical engineers are concerned about the mechanics of energy — how it is generated, stored, and moved. For example, mechanical and civil engineers ensure that there is sufficient potential energy, which is converted to kinetic energy, to move cars along an entire roller coaster ride.

"Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy."

"Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors."

Potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched. A steel ball has more potential energy raised above the ground than it has after falling to Earth.

Know more about kinetic energy here

https://brainly.com/question/12669551

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Answer:

for number 10

I can't see what needs to be calculated for the first question though

Answer:

F = 810 [N]

Explanation:

To solve this problem we must use the acceleration of gravity of the moon, which according to information provided by the internet we can see that the gravitational acceleration corresponds to 1.62 [m/s^2].

The weight of a body corresponds to the product of mass by gravity, so with the following equation we can find the weight.

F =m*g

F = 500 * 1.62

F = 810 [N]

Answer:

1. Installing solar panels on the roof. This is an example of renewable energy, and solar panels help provide electricity for a home.

2. Using LED lights instead of traditional lightbulbs. The modern LED lights use much less electricity and function up to 90% more efficiently than the traditional lightbulbs.

3. Using rain barrels to collect water from the roof. Installing rain barrels to collect rainwater to water your plants and garden is a great way to save water and cut down on your water bill.

Hope this helps! :)

Answer:

The initial energy emission occurs by 80% or more in the form of gamma rays but these are quickly absorbed and dispersed mostly by air in little more than a microsecond, converting gamma radiation into thermal radiation (thermal pulse ) and kinetic energy (shock wave) which are actually the two dominant effects in the initial moments of the explosion. The rest of the energy is released in the form of delayed radiation (fallout or fallout) and is not always counted when measuring the performance of the explosion.

Explanation:

High altitude explosions produce greater damage and extreme radiation flux due to lower air density (photons encounter less opposition) and consequently a higher blast wave is generated.

Answer:

it is friction

Explanation:

Answer:

Basic units=those units of measurement which do not depend upon any other units are called basic units. Example length, mass, time, current etc.

Derived units=those units which are expressed in terms of fundamental units are called derived units. Example area, volume, density etc.

Answer:

valence electron are exposed to nucleus of other atom,

Answer:

4.45×10¯⁷ N

Explanation:

The following data were obtained from the question:

Mass 1 (M₁) = 600 Kg

Mass 2 (M₂) = 400 Kg

Gravitational constant (G) = 6.67×10¯¹¹ Nm²Kg¯²

Sperating distance (r) = 6 m

Force (F) =.?

The gravitational force can be obtained as follow:

F = GM₁M₂ / r²

F = 6.67×10¯¹¹ × 600 × 400 / 6²

F = 1.6008×10¯⁵ / 36

F = 4.45×10¯⁷ N

Therefore, the gravitational force is 4.45×10¯⁷ N

Answer:

F = 0.483 N

Explanation:

Initial momentum, [tex]P_i= 7\ kg-m/s[/tex]

Final momentum, [tex]P_f= 22\ kg-m/s[/tex]

Time, t = 31 s

We need to find the force of a lead ball. We can use here the impulse momentum theorem.

[tex]\text{Change in momentum}=F\times t[/tex]

F is force

[tex]P_f-P_i=Ft\\\\F=\dfrac{P_f-P_i}{t}\\\\F=\dfrac{22-7}{31}\\\\F=0.483\ N[/tex]

So, the force is 0.483 N.

Answer:

the pollution

Explanation:

because is making big consecuences in the world

If I could solve one of  the world's greatest problems, then I would  like to choose pollution problem.

I would choose the pollution problem to be solved because it affects various natural resources of the environment.

Pollution is one the biggest issue in the world these days and It is rising day by day. It affects the environment directly or indirectly.

There are various types of pollution. Some of thees are

The main cause of water pollution is various toxic substances got mixed in various water resources.

Similarly Air Pollution happens because of the harmful gases and substances present in the air.

Noise pollution occurs due to the sound of machines, loud musics and sound of vehicles.

Every human being should take steps to solve the issue of the pollution.

For more information about the pollution, follow the link given below.

https://brainly.com/question/1040743.

Answer:

v = u - gt

At maximum heitht, v = 0

0 = u - (9.8)(3)

u = 29.4 m/s initial velocity

Answer:

A submission from India says the name Priyadharshini means "Beloved and pleasing to look at" and is of Sanskrit origin. According to a user from India, the name Priyadharshini is of Indian (Sanskrit) origin and means "God gift".

Answer:

vx = 65 yd/3 sec  = 21.7 yd/sec  since horizontal speed is constant

vy = g t = (32 / 3) yd/sec^2 * 1.5 sec = 16 yd/sec   where 32/3 is the acceleration due to gravity in yds / sec^2  and 1.5 is the time to travel each way in the vertical direction

V = (vx^2 + vy^2)^1/2 = (21.7^2 + 16^2)^1/2 = 27 yd/sec

tan theta = vy/vx = 16 / 21.7 = .737    theta = 36.4 deg

You can check using the range formula:

R = v^2 sin (2 theta) / g = 27^2 * .955 / (32 / 3) = 65.3 yds  

The difference from 65 yds may be rounding error.

Answer:

Democritus had no scientific instruments to extend the reach of his senses, so all of his experiments were just 'mind experiments', but because Democritus was a philosopher, he thought more into depth about why we humans are alive which led to the atomic theory.

Explanation:

Answer:

d = 11.77 m

Explanation:

Given that,

A ball is droped off the side of a bridge after 1.55 seconds.

We need to find how far it has fallen.

It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²

Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :

[tex]d=ut+\dfrac{1}{2}at^2[/tex]

Put u = 0 and a = g

So,

[tex]d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m[/tex]

Hence, it will fall at a distance of 11.77 m.

Answer:

-11.77!!!! DONNT FORGET NEGATIVE

Explanation:

Answer:

40,000N of force

Explanation:

The formula for force is F=ma. If we plug in the values, F=(20,000kg)(2m/s^2).

Answer:

Somatic motor neurons originate in the central nervous system, project their axons to skeletal muscles (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion.

Explanation:

Muscles move on commands from the brain. Single nerve cells in the spinal cord, called motor neurons, are the only way the brain connects to muscles. When a motor neuron inside the spinal cord fires, an impulse goes out from it to the muscles on a long, very thin extension of that single cell called an axon.

Answer:

(1) 2.25m/s^2

(2) 45.6m

Explanation:

(1) A car accelerates uniformly from 12m/s to 39m/s in 12 seconds

Therefore the average acceleration can be calculated as follows

a = 39-12/12

a = 27/12

a= 2.25m/s^2

(2) A butterfly is flying at 4m/s , it accelerates uniformly at 1.2 m/s for 6 seconds

u= 4

a= 1.2

t= 6

Therefore the distance can be calculated as follows

S= ut + 1/2at^2

= 4×6 + 1/2 × 1.2 × 6^2

= 24 + 1/2 × 1.2 × 36

= 24 + 1/2 × 43.2

= 24 + 21.6

S = 45.6m

Hence the butterfly travels at 45.6m

1800 sec = 30 min

Hi there !

18km = 18×1000m = 18000 m

1 s ............... 10m

x s ...............18000m

x = 1×18000/10 = 1800 sec = 30 min

Good luck !

Answer:

an underground conduit for carrying off drainage water and waste matter

Explanation:

Answer:

an underground conduit for carrying off drainage water and waste matter.

Explanation:

Answer:

0.267 m/s^2

Explanation:

6 km/hr * 1hr/ 3600 sec * 1000m/ 1 km

1.67 m/s to 3 m/s

vf=vi+at

3 m/s= 1.67 m/s+ a(5 s)

a=0.267 m/s^2

Answer:

1-Average speed

2-constant

Explanation:

Question 1 : You have the distance and time , need to find average speed

Question 2 : traveling at the same speed that means it's constant

Answer:

speed = 12 miles per second

= 12 mi/s

Explanation:

Answer:

The average speed is 5.8 m/s

Explanation:

I just did it