When energy and matter are paired with what they are one in the same

An ice skater can change the rate of their spin by moving their arms into and away from their body without any other forces or t

pychu [463]

Answer:

Angular momentum is conserved if there are no external forces

P1 = P2

I1 ω1 = I2 ω2

ω2 / ω1 = I1 / I2

If the skater pulls their arms in (I2 < I1) then the angular speed must increase for angular momentum to be conserved.

3 0

3 years ago

Calculate the heat gained by 100 grams of ice at -20°C in order to become water at 50°C. ( C = .5 for ice and C = 1 for water, Q

Korvikt [17]

Answer:

$6008$ cal

Explanation:

$m_{i}$ = mass of ice = 100 g = 0.1 kg

$c_{i}$ = specific heat of ice = 0.5 cal/(kg°C)

$c_{w}$ = specific heat of water = 1 cal/(kg°C)

$L$ = Latent heat of fusion of ice = 80 J/g

$T_{i}$ = initial temperature of ice = - 20 °C

$T_{f}$ = final temperature of ice = 50 °C

Q = Heat gained

Heat gained is given as

$Q = m_{i} c_{i}(0 - (T_{i}))+ m_{i}L + m_{i}c_{w}(T_{i} - 0)$

$Q = (100) (0.5) (0 - (- 20))+ (0.1)(80) + (100) (1)(50 - 0)$

$Q = 6008$ cal

8 0

4 years ago

A car travels 70 km in two hours 104 km in the next 1.5 hours and then 79 km in two hours before reaching its destination what w

stiks02 [169]

Average speed = (total distance) / (total time)

Total distance = (70km + 104km + 79km) = 253 km

Total time = (2hr + 1.5hr + 2hr) = 5.5 hrs

Average speed = (253 km) / (5.5 hrs)

Average speed = 46 km/hr

4 0

4 years ago

What is the thinnest film (but not zero) that produces a strong reflection for green light with a wavelength of 500 nm ?

Marizza181 [45]

The thinnest film (but not zero) that produces a strong reflection for green light with a wavelength of 500 nm is 200 nm.

The wavelength of mild, λ = 500 nm

= 500 x 10^-9 m

Refractive index of oil, n1 = 1.25

Refractive index of water, n2 = 1.33

The thickness of the movie, d =?

For a sturdy mirrored image, m = 1

Wavelength, λ= 2 n1 d / m

Thickness, d = λ m / 2 n1

= 500 x 10 -9 * 1 / ( 2 * 1.25 )

= two hundred x 10 -nine m

= 2 hundred nm.

Wavelength is the gap between the same factors (adjacent crests) within the adjacent cycles of a waveform signal propagated in space or alongside a wire. In wireless systems, this duration is usually specified in meters (m), centimeters (cm), or millimeters (mm).

Wavelength may be defined as the space between two successive crests or troughs of a wave. it is measured within the route of the wave.

Wavelength is the distance among two adjacent crests or troughs of a waveform signal propagated in space or along a wire. The wavelength of a wave is usually specified in meters (m), centimeters (cm), or millimeters (mm). The wavelength is inversely related to frequency.

Learn more about Wavelength here brainly.com/question/10750459

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3 0

2 years ago

A microphone is attaced to a spring that is suspended from

kirill115 [55]

To solve this problem we will apply the concept related to the amplitude and the Doppler effect. The difference between the maximum and minimum frequency detected by the microphone would be given by the mathematical function

$f_{max} - f_{min} = 2 f_s (\frac{v_0}{v})$