The first element on the periodic table of elements is helium true of false

Physics

1 answer:

makvit [3.9K]3 years ago

8 0

Answer:

false

Explanation:

it's hydrogen. also hydrogen has one proton and stuff and helium two

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The period of a simple pendulum is 3.8 s. the length of the pendulum is doubled. what is the period t of the longer pendulum? t

Varvara68 [4.7K]

5.28519s assuming acceleration of gravity is 9.8m/s. When I doubled the length of the pendulum I used 70 since the original was 35.15234.

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3 years ago

Jeremy was asked to describe the impact of humans on the carbon cycle. He answered: "When people

zmey [24]

Answer:

Humans add carbon dioxide to the atmosphere when they burn fuel in factories and other biomass sources. Humans take in carbon from the food they eat from the soil and return it back to the soil through waste products and decomposition.

Explanation:

When humans add carbon into the atmosphere the main contributors are burning of substances like fuels and biomass and from eating.

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3 years ago

A 90. 0-kg ice hockey player hits a 0. 150-kg puck, giving the puck a velocity of 45. 0 m/s. If both are initially at rest and i

Mice21 [21]

The distance traveled by the hockey player is 0.025 m.

<h3>The principle of conservation of linear momentum;</h3>

The principle of conservation of linear momentum states that, the total momentum of an isolated system is always conserved.

The final velocity of the hockey play is calculated by applying the principle of conservation of linear momentum;

$m_1v_1 = m_2 v_2\\\\v_1 = \frac{m_2 v_2}{m_1} \\\\v_1 = \frac{0.150 \times 45}{90} \\\\v_1 = 0.075 \ m/s$

The time taken for the puck to reach 15 m is calculated as follows;

$t = \frac{d}{v} \\\\t = \frac{15\ m}{45 \ m/s} \\\\t = 0.33 \ s$

The distance traveled by the hockey player at the calculated time is;

$d = vt\\\\d = 0.075 \ m/s \ \times 0.33 \ s\\\\d = 0.025 \ m$

Learn more about conservation of linear momentum here: brainly.com/question/7538238

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2 years ago

a 2.0kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill, how fast will it be going?

ratelena [41]

Speed of ball is 19.80 m/s .

<u>Explanation:</u>

We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:

We know that,

Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by $P.E = mgh$ , where m is mass , g is acceleration due to gravity & h is height !

Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by $K.E = \frac{1}{2}mv^2$ , where m is mass & v is the velocity of object !