Answer:
Percent error = -4.7%
Explanation:
Given data:
Actual density value = 19.3 g/cm³
Measured value of density by student = 18.4 g/cm³
Percent error = ?
Solution:
Formula:
Percent error = ( measured value - actual value / actual value ) × 100
Now we will put the values.
Percent error = ( 18.4 g/cm³ - 19.3 g/cm³ / 19.3 g/cm³) × 100
Percent error = (-0.9 g/cm³ / 19.3 g/cm³) × 100
Percent error = -0.047 × 100
Percent error = -4.7%
Negative sign shows that measured value is less than actual value.
Q. Which object is accelerating?
A: A skateboarder speeding up as he skates down a ramp.
The car is not accelerating as it is travelling at constant velocity. Acceleration refers to the rate of change of velocity of an object over time. Thus, there is no acceleration for the car.
The bicycle is not accelerating as it is decelerating (slowing down). This is not to be confused with accelerating in the opposite direction. Deceleration refers to the rate at which an object slows down. Deceleration is a scalar quantity whereas acceleration is a vector quantity. Yeah.
The final one isn't right, well, because the first two options are wrong.
So through process of elimination, you can deduce that the skateboarder experiences acceleration.
Also, the skateboarder experiences acceleration as he is "speeding up", implying that his speed is not constant and in fact increasing, so there's acceleration.
Answer:
the answer is petroleum
Explanation:
This is because they need a bigger drill to get to it. They also need to go down to the level oil is found.
i hope this helps
For such calculation, we apply Planck's equation:
E = nhc / λ; where n is the number of photons, h is the Planck's constant, c is the speed of light and λ is the wavelength of the light.
As is visible from the equation, energy and wavelength have an inverse relationship. Therefore, larger energy drops produce smaller wavelengths and smaller drops produce larger wavelengths.
Answer:
C. This is a direct current circuit.
Explanation:I answered this question on a quiz and got it correct.