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3 years ago

What is the most likely reason that Mendeleev placed tellurium before iodine?

1 answer:

8 0

Mendeleev watched that tellurium has compound properties like different components in its gathering, and he didn't realize that neutrons cause the more noteworthy nuclear mass. Mendeleev expressed that he anticipated that tellurium would have a lower nuclear mass than iodine.

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Explain why we say that energy from the washing machine is wasted' as thermal energy?

antoniya [11.8K]

Explanation:

In washing machine, the electrical energy is converted in kinetic energy then the mechanical energy is converted into thermal (heat) energy.

3 0

2 years ago

From a branch 35 m high, a 0.75 kg bird dives into a small fish tank containing

Bad White [126]

Answer:

ΔT = 1.22*10^-3 °C

Explanation:

First, you calculate the potential energy of the bird when it is at 35 m high. The potential energy is also the mechanical energy of the bird in this case.

$U=mgh$

m: mass of the bird = 0.75kg

g: gravitational constant = 9.8m/s^2

h: height = 35m

$U=(0.75kg)(9.8m/s^2)(35m)=257.25\ J$

All this energy is given to the water. You use the following formula in order to calculate the change in temperature:

$Q=mc\Delta T$

m: mass of the water = 50kg

c: specific heat of water = 4186 J/kg°C

Q is equal to U (potential energy of the bird) because the bird gives all its energy to water. By doing ΔT the subject of the formula you obtain:

$\Delta T=\frac{Q}{mc}=\frac{257.25J}{(50kg)(4186J/kg°C)}=1.22*10^{-3}\ \°C$

hence, the maximum rise in temperature is 0.00122 °C

7 0

3 years ago

How can an athlete participating in a 40m sprint modify and improve their performance based on the kinematic variable of speed a

aleksandrvk [35]

The athlete can improve performance by building strength, coordination and balance.

<h3>Who is an Athlete?</h3>

This is an individual who is proficient in sports and other forms of physical exercise.

Improvement of performance based on the kinematic variable of speed and acceleration can be achieved by building strength, coordination and balance by performing plyometric exercises etc.

Read more about Athlete here brainly.com/question/1532968

5 0

3 years ago

Hey I need help w/ this pic below ASAP!!!<br> Pls will mark brainliest:) Not joking lol

Arturiano [62]

Where is the picture

4 0

3 years ago

Read 2 more answers

An elevator held by a single cable is ascending but slowing down. Is the work done by tension positive, negative, or zero? What

inessss [21]

Explanation:

1.) Work = Force*Distance

2.) The direction of motion lies in the same direction as the tension in the cable. So the work done by tension would be positive.

3.) The direction of the weight (due to gravity) would act opposite to the direction of motion of the elevator, so work done by gravity becomes negative.

8 0

4 years ago