Which statement demonstrates that ultraviolet (UV) rays are electromagnetic waves?

Vanyuwa [196]

Explanation:

A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive 'squeaky pop' sound.

3 0

3 years ago

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Each wheel of a 320 kg motorcycle is 52 cm in diameter and has rotational inertia 2.1 kg m2 . The cycle and its 75 kg rider are

Amiraneli [1.4K]

Answer:

The value is $h = 32.91 \ m$

Explanation:

From the question we are told that

The diameter of each wheel is $d = 52 \ cm = 0.52 \ m$

The mass of the motorcycle is $m = 320 \ kg$

The rotational kinetic inertia is $I = 2.1 \ kg \ m^2$

The mass of the rider is $m_r = 75 \ kg$

The velocity is $v = 85 \ km/hr = 23.61 \ m/s$

Generally the radius of the wheel is mathematically represented as

$r = \frac{d}{2}$

=> $r = \frac{0.52}{2}$

=> $r = 0.26 \ m$

Generally from the law of energy conservation

Potential energy attained by system(motorcycle and rider ) = Kinetic energy of the system + rotational kinetic energy of both wheels of the motorcycle

=> $Mgh = \frac{1}{2} Mv^2 + \frac{1}{2} Iw^2 + \frac{1}{2} Iw^2$

=> $Mgh = \frac{1}{2} * Mv^2 + Iw^2$

Here $w$ is the angular velocity which is mathematically represented as

$w = \frac{v }{r }$

So

$Mgh = \frac{1}{2} * Mv^2 + I \frac{v}{r} ^2$

Here $M = m_r + m$

$M = 320 + 75$

$M = 395 \ kg$

$395 * 9.8 * h = 0.5 * 395 * (23.61)^2 + 2.1 *[\frac{ 23.61}{ 0.26} ] ^2$

=> $h = 32.91 \ m$

7 0

4 years ago

What kind of relationship exists between sound and the temperature of material

KATRIN_1 [288]

speed increases with temp maybe

8 0

3 years ago

A cosmic ray proton moving toward the Earth at 5.00 10 m/s 7 × experiences a magnetic force of 1.70 10 N −16 × . What is the str

EastWind [94]

Answer:

Magnetic field will be equal to $B=3\times 10^{-5}T$

Explanation:

We have given velocity of proton $5\times 10^7m/sec$

Magnetic force experienced by proton $F=1.7\times 10^{-16}N$

Charge on proton $q=1.6\times 10^{-19}C$

Angle between field and velocity $\Theta =45^{\circ}$

Force in magnetic field is equal to $F=qBVsin\Theta$

So $1.7\times 10^{-16}=1.6\times 10^{-19}\times 5\times 10^7\times B\times sin45^{\circ}$

$B=3\times 10^{-5}T$

So magnetic field will be equal to $B=3\times 10^{-5}T$

7 0

3 years ago

Which of the following is true about free energy? A. It is all the energy that a molecule contains B. The free energy change of

son4ous [18]

Free energy is a thermodynamic potential that can be used to calculate the maximum reversible work that can be performed by a thermodynamic system at a constant temperature and pressure. It is fulfilled that if the energy change is less than zero it will mean that the relationship will proceed towards the product, while if the relationship is greater than zero the reaction will proceed towards the reactant. Therefore the correct option is D.

<em>The free energy change of a reaction can determine the reaction direction</em>

3 0

3 years ago