Which characteristic will be affected by increasing the speed of an object from 30 meters per second (m/s) to 40 meters per second(m/s)?(1 point)
Responses
Gravitational attraction
kinetic energy
mass
weight
kinetic energy
Two watermelons fall off a kitchen counter. The masses and speeds of the fruits are in the table. (Watermelon A mass 4 speed 2) (watermelon b mass 4 speed 4.) How do the kinetic and/ or the potential energies of the fruits compare?
1) Both have the same kinetic and potential energy
2) Both fruits only have potential energy and no kinetic energy
3) Watermelon A has more kinetic energy.
4) Watermelon B has more kinetic energy.
The correct answer is:
4) Watermelon B has more kinetic energy.
Kinetic energy is calculated using the formula KE = (1/2)mv^2, where m is the mass and v is the velocity (speed).
Comparing the two watermelons, Watermelon A has a mass of 4 and a speed of 2, resulting in a kinetic energy of KE_A = (1/2)(4)(2)^2 = 8 units.
On the other hand, Watermelon B has the same mass of 4, but a higher speed of 4, resulting in a kinetic energy of KE_B = (1/2)(4)(4)^2 = 32 units.
Therefore, Watermelon B has more kinetic energy than Watermelon A.
A student drops a 350-gram rock and a 500-gram rock into a pool from a height of 8 meters. Which statement about the investigation is accurate?
You haven't provided any statements to choose from. Could you please provide the given statements?
A student drops a 350-gram rock and a 500-gram rock into a pool from a height of 8 meters. Which statement about the investigation is accurate?
A) The 500-gram rock causes a larger splash because it has more kinetic energy
B) The 350-gram rock causes a smaller splash because it has more kinetic energy
C) The 350-gram rock causes a larger splash because it has less mass
D) The 500-gram rock causes a smaller splash because it has more mass
The correct statement from the options provided is:
A) The 500-gram rock causes a larger splash because it has more kinetic energy.
Kinetic energy is directly proportional to both mass and speed. When comparing two objects with the same height from which they are dropped, the object with greater mass will have more kinetic energy upon impact.
In this case, the 500-gram rock has a greater mass than the 350-gram rock. Therefore, it will have more kinetic energy as it falls and strikes the water's surface. The greater kinetic energy results in a larger splash.
A student drops several objects of the same size into a bucket of water from a height of 2 meters. She ranks the splash size from 1-4, with 1 being the smallest splash and 4 being the largest splash. Which object most likely has the greatest mass?
Object l Splash size ranking
W 2
X 4
Y 1
Z 3
Based on the given information, we can conclude that:
Object X, with a splash size ranking of 4, most likely has the greatest mass.
The characteristic that will be affected by increasing the speed of an object from 30 meters per second (m/s) to 40 meters per second (m/s) is the kinetic energy.
To understand why, let's break down the options and eliminate them one by one:
1. Gravitational attraction: This characteristic depends on the mass of the object and the distance between the objects. Since the speed of the object is changing, it doesn't directly affect the force of gravitational attraction. Therefore, it's not the correct answer.
2. Mass: The mass of an object remains constant regardless of its speed. So, increasing the speed does not directly affect the mass. Hence, it is not the correct answer.
3. Weight: Weight is the force exerted on an object due to gravity. It is given by the formula weight = mass × acceleration due to gravity. Since both mass and acceleration due to gravity remain constant, increasing the speed does not affect the weight of the object. Therefore, it is not the correct answer.
4. Kinetic energy: Kinetic energy is given by the formula KE = 0.5 × mass × velocity^2. As you can see, kinetic energy is directly proportional to the square of the velocity. So, if the speed of an object increases from 30 m/s to 40 m/s, its kinetic energy will increase. Therefore, the correct answer is kinetic energy.
In summary, increasing the speed of an object from 30 m/s to 40 m/s will affect the object's kinetic energy.