What is the speed of a car that travels a distance of 520 kilometers in 12 hours? 0.43 km/hr 0.023 km/hr 62.4 kmhr 43 km/hr

The correct answer would be 43 km/hr.

Speed is defined as the rate at which a person or a thing is moving.

It can be calculated by dividing total distance traveled by the total time taken to cover that distance.

Speed = Distance / time

It is provided that a car traveled 520 kilometers in 12 hours.

So, the distance = 520 kilometers

Time = 12 hours

Speed = 520/12 kilometers per hour

= 43.33 kilometers per hour.

i need

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.