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Responses
conduction because it causes warmer air to rise up and the cooler more dense air to sink to the ground.
conduction because it causes warmer air to rise up and the cooler more dense air to sink to the ground.
convection because it causes the warmer air to rise up and the cooler more dense air to sink to the bottom.
convection because it causes the warmer air to rise up and the cooler more dense air to sink to the bottom.
radiation because it causes thermal energy to transfer through direct contact.
radiation because it causes thermal energy to transfer through direct contact.
conduction because it causes the heat to transfer through the electromagnetic waves into the sky.
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The correct response is:
convection because it causes the warmer air to rise up and the cooler more dense air to sink to the bottom.
In the case of volcanoes, the hot smoke (and gases) are less dense than the cooler surrounding air, which causes the hot smoke to rise due to convection currents.
To determine the correct graph showing the relationship between potential energy and the total mass of an object, we need to consider how potential energy (PE) is defined. The gravitational potential energy of an object, for example, is given by the formula:
\[ PE = mgh \]
where:
From this formula, we can see that potential energy is directly proportional to the mass of the object, assuming height and gravity remain constant. This means that as mass increases, potential energy will also increase linearly.
So, a graph that correctly depicts this relationship would typically be a straight line that starts from the origin (0,0) and rises linearly as the mass increases.
If you provide the options for the graphs, I can help identify the one that correctly represents this relationship.
The relationship between kinetic energy (KE) and velocity (v) of an object is described by the formula:
\[ KE = \frac{1}{2} mv^2 \]
where:
From this formula, we can see that kinetic energy is proportional to the square of the velocity. This means that if you were to graph kinetic energy (on the y-axis) against velocity (on the x-axis), the graph would be a curve that starts at the origin (0,0) and increases quadratically. This would appear as a parabola opening upwards.
So, the correct graph would show a curve that rises sharply as velocity increases, illustrating that kinetic energy increases with the square of velocity.
If you have specific graph options, I can help you select the one that accurately represents this relationship.
The correct response is:
Thermal energy will flow from the oven into the turkey until they reach equilibrium at 100°C.
Here's the reasoning: When the turkey, which is at room temperature (45°C), is placed in a hot oven (185°C), thermal energy will transfer from the hotter oven to the cooler turkey. This process will continue until both the turkey and the oven reach thermal equilibrium, which will likely occur at a temperature close to the point where the turkey is cooked (around 100°C for turkey). The temperature of the oven itself will decrease, but since the turkey is absorbing heat, it will continue to warm up until reaching that equilibrium temperature.
The statement that describes an object acted on by balanced forces is:
A bus is stopped at a station waiting to pick up passengers.
Balanced forces mean that the net force acting on an object is zero, which results in no change in the object's state of motion. In this case, the bus is not moving, indicating that all forces acting on it (like friction and forces from the ground) are balanced.
Similarly, a car moving at a constant speed around a race track can also be considered to have balanced forces, as long as it is not accelerating (but it will be experiencing centripetal force while turning). However, since the question asks for the clearest example, the stopped bus is the best choice.
Based on the information you've provided about a straight line graph showing total distance traveled versus time, the correct statement is:
The speed of the object is constant.
In a distance versus time graph, a straight line indicates that the object is moving at a constant speed. If the line were to curve upward, that would indicate that the speed was increasing. If the line were flat (horizontal), it would indicate that the object is not moving. Since the line is straight, it means the speed remains unchanged throughout the time interval.
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