Question

Physics

1. A car travels from a stopped position to a velocity of 88 miles per hour east in a time of 6 seconds. Determine the acceleration of the car.

2. airplane is moving across the sky at a constant speed of 350 miles per hour at an altitude of 20,000 feet.
a) Make a model (picture or diagram) explaining the forces working on the plane as it moves across the sky.
b)Explain why the plane does not move towards the surface of the earth.
c) If the speed of the plane slows down to zero, explain what will happen to the plane and why?

3. Determine which of the following is has the fastest speed:
A cat with a speed of 4m/s or a dog running with a speed of 3.5 km/hr.

4. A student travels from Angeles to New York city. If his watch says 12:15 pm at tale off from Los Angeles and lands in
New York at 3:45 pm. The distance travelled is 3,450 kilometers. Determine the average speed of the plane in m/s.

Answer 1

sorry i am late

Step-by-step explanation:

To determine the acceleration of the car, we can use the formula: acceleration = (final velocity - initial velocity) / time. In this case, the initial velocity is 0 (the car is stopped), the final velocity is 88 mph, and the time is 6 seconds. So: acceleration = (88 - 0) / 6 = 14.67 mph/s.

a) The forces working on the plane as it moves across the sky include thrust from the engines, lift generated by the wings, weight (or gravity), and drag (air resistance).

b) The plane does not move towards the surface of the earth because the lift generated by the wings is greater than the weight (or gravity) pulling the plane down.

c) If the speed of the plane slows down to zero, the plane will begin to fall towards the surface of the earth. This is because the lift generated by the wings depends on the speed of the plane and at zero speed, there is no lift to counteract the weight of the plane.

To determine which of the two options has the fastest speed, we need to convert the speed of the dog to m/s. 3.5 km/hr is equivalent to 0.978 m/s. Therefore, the cat (with a speed of 4 m/s) is faster than the dog.

To determine the average speed of the plane, we can use the formula: average speed = distance traveled / time taken. The distance traveled is 3,450 kilometers, and the time taken is 3 hours and 30 minutes (or 3.5 hours in decimal form). So: average speed = 3,450 / 3.5 = 985.71 km/h. To convert this to m/s, we can multiply by 1000/3600 = 0.277 m/s. So the average speed of the plane is 0.277 m/s