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fgiga [73]
3 years ago
5

Which scientist discovered the two radioactive elements radium and polonium?

Physics
1 answer:
kolezko [41]3 years ago
6 0
The scientist who discovered the two elements radium and polonium would be Marie Curie in 1898.

Hope this helps!
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Which heavenly bodies are involved in causing the earths tides?
artcher [175]
The answer is --> C. <span>the earth, moon, and sun.

</span>The gravitational pull of the moon and the sun creates tides<span> on the </span>earth<span>.
</span>
3 0
3 years ago
What vertical distance Δy does a free-falling particle travel from the moment it starts to the moment it reaches a speed of 7.9
mr_godi [17]

Answer:

3.2 m

Explanation:

The equation to use to solve this problem is:

v_f^2 = v_i^2 + 2 a \Delta y

where

v_f is the final velocity

v_i is the initial velocity

a is the acceleration

\Delta y is the distance covered

For the particle in free-fall in this problem, we have

v_i = 0 (it starts from rest)

v_f = 7.9 m/s

g=9.8 m/s^2 (acceleration due to gravity)

By re-arranging the equation, we can find the distance travelled:

\Delta y = \frac{v_f^2 -v_i^2}{2a}=\frac{(7.9 m/s)^2-0^2}{2(9.8 m/s^2)}=3.2 m

5 0
3 years ago
A sound wave has a frequency of 425Hz. What is the period of this wave? a) 0.00235 b) 0.807 c) 425 d) 850
swat32

the answer is a) 0.00235 because 1/425=0.00235. hope I helped!

3 0
3 years ago
For 1983 through 1989, the per capita consumption
Tresset [83]

Answer:

y = 43.55 + 2.15t

Explanation:

We were told that in 1983, the per capita consumption was 37.1 pounds, and in 1989 it was 50 pounds.

If we assume t = 0 corresponds to year 1980. Then, for 1983 it will be t = 3 and for 1989,it will be t = 9.

Thus, expressing the information as ordered pairs, we have; (3,37. 1) and (9,50).

Let us now find slope of the linear function:

m1 = (y2 - y1)/(t2 - t1)

m1 = (50 - 37.1)/(9 - 3)

m1 = 2.15

So, we can find the linear equation as;

y - 37.1 = 2.15(t - 3)

y = 37.1 + 2.15t - 6.45

y = 43.55 + 2.15t

8 0
3 years ago
An object falling under the influence of gravity and no other force is said to be
miv72 [106K]

Answer:

true

Explanation:

free fall is said to be the downward movement of an object under the force of gravity only

7 0
3 years ago
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