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3 years ago

Where in our daily lives do we encounter "background" radiation

Physics

1 answer:

Tcecarenko [31]3 years ago

8 0

Answer:

Explanation:Naturally occurring radioactive materials are present in its crust, the floors and walls of our homes, schools, or offices and in the food we eat and drink. There are radioactive gases in the air we breathe. Our own bodies - muscles, bones, and tissue - contain naturally occurring radioactive elements.

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An overnight rainstorm has caused a major roadblock. Three massive rocks of mass m1=528 kg, m2=838 kg and m3=311 kg have blocked

JulsSmile [24]

Answer:

$FA=419,25N$

$F12=287,25N$

Explanation:

The bulldozer is moving the rocks as one system, the weigth for the complete system is:

$M=m1+m2+m3=1677kg$

From newton´s second law the acceleration can be related to the force by:

$FA=m*a=1677kg*0,250m/s^{2}=419,25N$

on the middle rock we have the force F12 from the first to the middle rock on the direction of movement and F32 from the las rock to the middle rock on the opposite direction of movement.

For the last rock to accelerate at the same rate it must be subjected to a force:

$F23=m3*a=311kg*0,250m/s^{2} =77,75N$

This equals the force F32 on the opposite direction. the resultant force on the middle rock to mantain this acceleration should be:

$F2=m2*a=838kg*0,250m/s^{2} =209,5N$

The sum of all the forces applied to the middle rock is:

$F2=F12-F32$

Solving for F12:

$F12=F2+F32=209,5N+77,75N=287,25N$

3 0

3 years ago

A rocket takes off against the force of gravity. Consider this a non-isolated system. Derive the rocket equation formula relatin

Zielflug [23.3K]

Answer:

Explanation:

The solution of the question has been put in attachment.

8 0

3 years ago

Power Rating of a Resistor. The power rating of a resistor is the maximum power the resistor can safely dissipate without too gr

IgorLugansk [536]

(a) 273.9 V

The power rating of the resistor is given by

$P=\frac{V^2}{R}$

where

P is the power rating

V is the potential difference across the resistor

R is the resistance

If the maximum power rating is $P=5.0 W$ , and the resistance of the resistor is $R=15 k\Omega = 15000 \Omega$ , then we can find the maximum potential difference across the resistor by re-arranging the previous equation for V: