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Alisiya [41]
3 years ago
13

What is the difference between a measurement and an observation?A. Measurements are made with tools; observations are not.B. Obs

ervations are biased, while measurements are always unbiased.C. Measurements are compared to a standard; observations are not.D. Observations are only indirect ways of gathering data.
Physics
1 answer:
choli [55]3 years ago
8 0

Answer:

A. Measurements are made with tools; observations are not

Explanation:

Measurement: <em>the assignment of numbers or codes according to prior-set rules. </em>

Observation: <em>data from an individual study subject or sampled unit.</em>

Measurement error: <em>differences between "true" answers and what appears on data collection instruments</em>

hope this helps

plz mark brainleist

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At what speed does a 2000 kg compact car have the same kinetic energy as a 18000 kg truck going 21 km/hr?
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Answer:

v = 17.5 m/s = 63 km/h

Explanation:

  • The general expression for the kinetic energy of one moving object is as follows:

       K = \frac{1}{2}*m *v^{2}  (1)

       where m = mass of the object, v= speed of the object.

  • In order to get the value of the kinetic energy of the truck in Joules, we need to convert km/hr to m/s first, as follows:

       21 km/hr * \frac{1 hr}{3600s}*\frac{1000m}{1 km} = 5.83 m/seg  (2)

  • Now, replacing (2) and m = 18000 kg in (1), we get:

       K = \frac{1}{2}*18000 kg *(5.83m/s)^{2} = 306250 J  (3)

  • This value must be the same for the 2000 kg compact car, so we can write:

       K = 306250 J = \frac{1}{2}*2000 kg *v^{2}  (4)

  • Solving for v, we get:

       v = \sqrt{\frac{306250}{1000} (m/s)2} = 17. 5 m/s = 63 km/h (5)

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3 years ago
What are the rows of the periodic table of the elements also called?
Ostrovityanka [42]

Answer:

periods

Explanation:

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What does it mean to say that science is a “systematic” process?
gogolik [260]
"1.<span> characterized by order and planning</span>
2.<span> not haphazard"
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a ball dropped from a height of 10 meters will bounce more times before coming to rest than a ball dropped from a height of 5 me
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Answer:

plz mark brainliest again lol :)

Explanation:

When you drop a ball from a greater height, it has more kinetic energy just before it hits the floor and stores more energy during the bounce—it dents farther as it comes to a stop.

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1/f =1/v+1/u

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