As shown below, an object with a mass of 5 kg is moving at a speed of 10 m/s. Another object with a mass of 10 kg is moving at a speed of 5 m/s. Which of the objects has higher kinetic energy? (1 point) Responses The objects have equal kinetic energy. The objects have equal kinetic energy. The 5 kg object has higher kinetic energy. The 5 kg object has higher kinetic energy. Both objects have zero kinetic energy. Both objects have zero kinetic energy. The 10 kg object has higher kinetic energy.
The kinetic energy of an object is given by the formula KE = (1/2)mv^2, where m is the mass of the object and v is its velocity.
For the first object with a mass of 5 kg and a speed of 10 m/s, the kinetic energy is KE = (1/2)(5 kg)(10 m/s)^2 = 250 J.
For the second object with a mass of 10 kg and a speed of 5 m/s, the kinetic energy is KE = (1/2)(10 kg)(5 m/s)^2 = 125 J.
Therefore, the object with a mass of 5 kg has a higher kinetic energy of 250 J compared to the 10 kg object's kinetic energy of 125 J.
Thus, the correct answer is: The 5 kg object has higher kinetic energy.
In an investigation of potential and kinetic energy, a student stands at the top of a hill and pushes a ball down the hill as shown. How does the potential and kinetic energy of the ball change as the ball rolls down the hill? (1 point) Responses The potential and kinetic energy of the ball both decrease. The potential and kinetic energy of the ball both decrease. The potential energy of the ball increases, and the kinetic energy of the ball decreases. The potential energy of the ball increases, and the kinetic energy of the ball decreases. The potential and kinetic energy of the ball both increase. The potential and kinetic energy of the ball both increase. The potential energy of the ball decreases, and the kinetic energy of the ball increases. The potential energy of the ball decreases, and the kinetic energy of the ball increases.
As the ball rolls down the hill, its position changes from a higher point to a lower point, which means the ball's potential energy decreases. At the same time, the ball gains speed and its velocity increases, indicating an increase in its kinetic energy.
Therefore, the correct answer is: The potential energy of the ball decreases, and the kinetic energy of the ball increases.
A light is connected to a battery as shown below. What type of energy transfer occurs? (1 point) Responses Chemical energy to mechanical energy to light energy Chemical energy to mechanical energy to light energy Mechanical energy to electrical energy to light energy Mechanical energy to electrical energy to light energy Electrical energy to mechanical energy to light energy Electrical energy to mechanical energy to light energy Chemical energy to electrical energy to light energy
Based on the given information, the battery is the source of electrical energy. This electrical energy is transferred to the light bulb, which then emits light energy.
Therefore, the correct answer is: Electrical energy to light energy.