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Describe the cardiac cycle?

The blood enters the heart from the superior and inferior vena cava. It then enters the right atrium. When the atria fill with blood, it's known as atrial systole as they are relaxed. Once the atria have fil...
EC
Answered by Eva C. • Biology tutor
2640 Views

A child weighing 50kg is pushed down a 2m long slide (u=0.1), angled at 45 degrees from the horizontal, at 5m/s. At what speed does the child reach the bottom of the slide?

Change in GPE=Change in KE + ResistanceResistance = ForcexDistnaceForce=Friction= R u = mass cos45 g 2 * 0.1Change in KE = 0.5 m*(v 2 -25)Change in GPE = m g 2Sin 45Can cancel down by m (both sides in all pa...
MW
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A new sports car accelerates using rockets at 5m/s for 30 seconds from some traffic lights and then decelerate for 45 seconds to a stop.

SUVAT Part (A) Part (B) S=? S=?U=0 U= Calc From A (V)V=? V= 0T=30s t=45sPart A: V=U+atV=0+5 30V= 150S=ut+at 2 S=0+5 30*30S=4500mPart B: S=(U+V) t/2S=75 45S=3375mTotal Distance = 3375+4500=7875
MW
Answered by Matthew W. • Maths tutor
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Describe and explain how the mammalian respiratory system is adapted for efficient gas exchange.

The mammalian respiratory system is adapted for efficient gas exchange by increasing the rate of diffusion through targeted manipulations of Fick's law. These manipulations are centred around maximising surf...
EW
Answered by Ethan W. • Biology tutor
20544 Views

What is the difference between the verbs "ser" and "estar" in Spanish? (Both are "to be")

While both verbs mean "to be", and are used in descriptions, they are both used in different situations. "Ser" is used in the case of adjectives and descriptions that will not change in a...
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Answered by Sofia d. • Spanish tutor
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