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Mariana [72]
3 years ago
14

a radioactive element has a half-life of 30 days. calculate the mass of the element that remains after 20 days if 100g of the el

ement decays. Also, calculate the decay constant.
Physics
1 answer:
patriot [66]3 years ago
4 0

Explanation:

the answer is in the image above

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A cruise ship made a trip to Guam and back. The trip there took 12 hours and the trip
Alecsey [184]

Answer:

The average speed is 8.0 km/h

Explanation:

We use the data for the return journey to calculate the distance travelled using the constant velocity equation:

s  =  v  t  =6*4=24km

 

Note I didn't change any units so the answer comes out in kilometres.

Now use the distance and time taken to travel to Guam to find the average speed:

v=st=24/3=8.0km/h

6 0
3 years ago
Before the widespread use of computers, how was the epicenter of an earthquake determined?
Nezavi [6.7K]
 Data was used from three different stations. Where their data overlapped was where the epicenter was located.
it is called triangulation 
7 0
3 years ago
Read 2 more answers
A water tank is in the shape of an inverted cone with depth 10 meters, and top radius 8 meters. Water is flowing into the tank a
Elis [28]

Answer:

The value of leaking rate in the question is repeated. By searching on the web I could find the correct value wich is 0.002h^2 m^3 /min.

The depth of the water has to be equal to 7.07 m in order to have a stationary volume.

Explanation:

In order to have a stationary water level the flow of water that comes into the tank (0.1 m^3/min) must be equal to the flow of water that goes out of the tank (0.002*h^2 m^3/min), therefore:

0.002*h^2 = 0.1

h^2 = 0.1/0.002

h^2 = 50

h = sqrt(50) = 7.07 m

7 0
3 years ago
If themass is 50kg, what weight of water is to be displaced to float on water? why
ludmilkaskok [199]

Answer:if youre looking for the weight of the thermas in genral it should be 500n

Explanation:using the formula w=mg

w=500x10

giving us 500 newtons which is the weight.

5 0
1 year ago
I need help on this science
Serga [27]
Ok ok ok ok ok ok ok ok ok
8 0
3 years ago
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