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vivado [14]
3 years ago
12

The least penetrating form of radiation consists of___.

Physics
1 answer:
galben [10]3 years ago
3 0
Alpha radiation is the least penetrative. Alpha particles contain two protons and two neutrons.
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A force of 2 kN is applied to an object to make it move 3.6 m in the direction of the force. Select the correct value of work do
vaieri [72.5K]

Answer:

W= F × d

W= 2kn × 3.6

W= 7.2 J

Work is measured in Joules!

4 0
3 years ago
A cat jumps off a piano that is 1.3m high. The initial velocity of the cat is 3m/s at an angle of 37degrees above the horizontal
SpyIntel [72]

Answer:

x=1.75m

Explanation:

From the exercise we have that

y_{o}=1.3m\\v_{o}=3m/s, \beta  =37\\

<em><u>To find how far from the edge of the piano does the cat strike the floor, we need to calculate its time first </u></em>

y=y_{o}+v_{oy}t+\frac{1}{2}gt^{2}

At the end of the motion y=0m

0=1.3+3sin(37)t-\frac{1}{2}(9.8)t^{2}

Solving for t

t=-0.36 s or t=0.73s

Since the <u>time</u> can't be negative the answer is t=0.73

Knowing that we can calculate how far does the cat strike the floor

x=v_{ox}t=3cos(37)(0.73)=1.75m

6 0
3 years ago
Help please
pychu [463]
The answer should be speed hope this helps

3 0
3 years ago
Read 2 more answers
The pedals on a bicycle give a mechanical advantage by allowing you to turn the pedals a __________ distance to turn the _______
denpristay [2]
Short distance to turn the circumference of the wheels. Mechanical advantage is load/effort I think
6 0
3 years ago
Read 2 more answers
You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of 252 N in the negative x di
pentagon [3]

(a) 252 N, opposite to the applied force

There are two forces acting on the refrigerator in the horizontal direction:

- the pushing force of 252 N, F, forward

- the frictional force, Ff, pulling backward

In this case, the refrigerator is not moving: this means that its acceleration is zero. According to Newton's second law, this also means that the net force acting on the refrigerator is also zero:

\sum F = ma = 0

So we have

F-F_f = 0

which means that the frictional force is equal in magnitude to the pushing force:

F_f = F = 252 N

and the direction is opposite to the pushing force.

(b) 334.8 N

The force that must be applied to the refrigerator to make it moving is equal to the maximum force of friction, which is given by:

F_{max} = \mu mg

where

\mu = 0.61 is the coefficient of static friction

m = 56 kg is the mass of the refrigerator

g = 9.8 m/s^2 is the acceleration of gravity

Substituting:

F_max = (0.61)(56 kg)(9.8 m/s^2)=334.8 N

6 0
3 years ago
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