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Physics (bio) / Fisika (bio) - 154

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Een punt van ’n 33 cm lang aluminiumstaaf met ’n deursnee van 2,0 cm word by 460 °C gehou, en die ander punt word in water by 22 °C gedompel. Bereken die warmtegeleidingsnelheid langs die staaf.

One end of a 33-cm-long aluminum rod with a diameter of 2.0 cm is kept at 460°C, and the other is immersed in water at 22°C. Calculate the heat conduction rate along the rod

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Wat is die wgk spoed van 'n proteïn met molekulêre massa u = 5.93x104 in 'n lewende sel by 38.4 C?

What is die rms speed of a protein of molecular mass u = 5.93x104 in a living cell at 38.4 C?

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Wat sal die ewewigstemperatuur wees wanneer ’n 245 g blok koper by 285°C in ’n 145 g aluminium-kalorimeterbeker geplaas word wat 825 g water by 12.0°C bevat?

Die spesifieke hitte van koper en aluminium is onderskeidelik 390 J kg⁻¹ K⁻¹ en 900 J kg⁻¹ K⁻¹.

What will be the equilibrium temperature when a 245-g block of copper at 285°C is placed in a 145-g aluminum calorimeter cup containing 825 g of water at 12.0°C?

The specific heat of copper and aluminum are 390 J kg⁻¹ K⁻¹ en 900 J kg⁻¹ K⁻¹., respectively.

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’n 100 W gloeilamp genereer 95 W hitte, wat deur ’n glasbol afgevoer word met ’n radius van 3,0 cm en ’n dikte van 1,0 mm. Wat is die temperatuurverskil tussen die binneste en buitenste oppervlak van die glas?

A 100-W lightbulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 3.0 cm and is 1.0 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?

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Indien 5.68 m3 van 'n ideale gas aanvanklik by Standaard Temperatuur en Druk (STD ~ 0 ºC en 1 atmosfeer) verkeer en daarna onder 'n druk van 5.17 atmosfeer geplaas word, dan styg die temperatuur tot 69.4 ºC. Wat is die volume (in m3) van die gas dan?

Suppose 5.68 m3 ideal gas, initially at Standard Temperature and Pressure (STP ~ 0 ºC and 1 atmosphere) is put under pressure of 5.17 atmosphere and the temperature increases to 69.4 ºC. What is the volume (in m3) of the gas?

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'n Massa m = 0.423 kg word versigtig aan die end van 'n vry hangende veer met onbekende veerkonstante k geheg. Wanneer vanuit rus vrygelaat, val die massa 'n afstand 97.5 cm voordat dit stop en weer opwaarts begin ossilleer. Wat is die frekwensie van die ossillasie?

A mass m = 0.423 kg is gently attached to  the end of a freely hanging spring with unknown spring constant k. When released from rest, the mass falls 97.5 cm before it stops and begins to rise. What is the frequency of the oscillation?

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'n Transversale golf op 'n tou word beskryf deur y left parenthesis x comma t right parenthesis space equals space A space cos space left parenthesis omega t plus k x right parenthesis. Dit kom by die punt x equals 0 waar die endpunt vas is. Watter funksie beskryf die gereflekteerde golf?

A transverse wave on a string is described by y left parenthesis x comma t right parenthesis space equals space A space cos space left parenthesis omega t plus k x right parenthesis. It arrives at the point x equals 0 where the string is fixed in place. Which function describes the reflected wave?

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Wanneer 'n golf van een medium na 'n ander beweeg, watter van hierdie hoeveelhede moet dieselfde bly?

When a wave passes from one medium into another, which of these quantities must stay the same?

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Die intensiteit van sonlig wat die aarde se atmosfeer bereik is 1400 W/m2. Wat is die intensiteit van die sonlig wat Jupiter bereik? Jupiter is 5,2 keer so ver van die Son as Aarde. [Wenk: Behandel die Son as 'n isotroop bron van liggolwe.]

The intensity of sunlight that reaches Earth’s atmosphere is 1400 W/m2. What is the intensity of the sunlight that reaches Jupiter? Jupiter is 5.2 times as far from the Sun as Earth. [Hint: Treat the Sun as an isotropic source of light waves.]

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'n Ambulans se sirene opereer by 'n frekwensie van 1,550 Hz. Watter frekwensie sal jy waarneem indien jy teen 30.0 ms-1 nader aan die ambulans beweeg, terwyl dit stilstaan?

The predominant frequency of an ambulance’s siren is 1,550 Hz when at rest. What frequency do you detect if you move with a speed of   30.0 ms-1 toward the ambulance?

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