which of the following is traveling faster than its terminal speed?
1)rain
2)snow
3)a shooting star(metor)
4)a rock that has fallen after breaking off a shear cliff face
5)a penny,18s after it has dropped from rest from a tower.
6)a skydiver going ~120mph at the moment parachute deployed
choose all that apply.
3
6 If the parachute is deployed and he is still going 120 mph
To determine which of the following options are traveling faster than their terminal speed, we need to understand the concept of terminal speed. Terminal speed is the maximum speed an object can reach when falling through a fluid, such as air, when the force of gravity pulling it downwards is balanced by the drag force acting in the opposite direction.
1) Rain: Raindrops are small and have a large surface area, causing them to experience significant air resistance. As a result, raindrops quickly reach their terminal speed, which is typically around 9-13 meters per second for raindrops of average size. Therefore, rain is not traveling faster than its terminal speed.
2) Snow: Similar to rain, individual snowflakes are small and have a large surface area. As a result, snowflakes also quickly reach their terminal speed, which can depend on the size and shape of the snowflake but is generally lower than rain's terminal speed. Therefore, snow is also not traveling faster than its terminal speed.
3) Shooting star (meteor): Shooting stars, also known as meteors, are objects that enter the Earth's atmosphere from space. They experience significant air resistance, causing them to heat up and burn as they streak across the sky. The terminal speed of a meteor can vary depending on its size, shape, composition, and angle of entry. However, even the fastest meteors do not typically exceed the speed of sound in the Earth's atmosphere. Therefore, a shooting star is not traveling faster than its terminal speed.
4) Rock fallen from a cliff face: Once a rock falls off a shear cliff face, it accelerates due to the force of gravity acting on it. However, as the rock gains speed and starts moving through the air, it experiences air resistance. Eventually, the force of air resistance will balance the force of gravity, and the rock will reach its terminal speed. Therefore, a rock fallen from a cliff face is not traveling faster than its terminal speed.
5) Penny dropped from a tower: When a penny is dropped from a tower, it accelerates due to gravity. However, since a penny is small and has a relatively high surface area, it experiences significant air resistance. After a certain time, the penny will reach a point where the force of gravity is balanced by the drag force of air resistance, and it will achieve its terminal speed. Therefore, a penny 18 seconds after being dropped from rest from a tower is not traveling faster than its terminal speed.
6) Skydiver with deployed parachute: A skydiver falling at the moment their parachute is deployed will experience a sudden increase in air resistance. This rapid change in the forces acting upon the skydiver causes a significant decrease in velocity. However, if the velocity of the skydiver, even after deploying the parachute, is higher than their terminal velocity (the maximum speed they can attain with an open parachute), they will be traveling faster than their terminal speed. Therefore, a skydiver going approximately 120 mph at the moment the parachute is deployed is traveling faster than their terminal speed.
In summary, the only option traveling faster than its terminal speed is the skydiver going approximately 120 mph at the moment the parachute is deployed (option 6). Options 1, 2, 3, 4, and 5 are not traveling faster than their respective terminal speeds.