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ra1l [238]
3 years ago
13

An advantage of the clinical method is that is

Physics
1 answer:
Pavel [41]3 years ago
6 0

Answer:

Little or no control is possible, relationships may be coincidental; cause-and effect relationships cannot be confirmed. Advantages of clinical method: Takes advantage of "natural clinical trials" and allows investigation of rare or unusual problems or events.

Explanation:

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Answer: Answered already

Explanation:

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Which of the following represents a covalent compound?<br><br> KF<br> NaCl<br> SBr3<br> Mg2O
slava [35]

Answer:

SBr3 is a covalent compound

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4 years ago
A ball is falling toward the ground. Which is true?
harina [27]
The net force is zero.
3 0
3 years ago
Read 2 more answers
A 2,200 kg railway freight car coasts at 3.6 m/s underneath a grain terminal, which dumps grain directly down into the freight c
suter [353]

Answer:

m_2=2554.83\ kg

Explanation:

Given that,

Mass of the car, m_1=2200\ kg

Initial speed of the car, u=3.6\ m/s

Final speed of the car, v=3.1\ m/s

To find,

The maximum mass of grain that it can accept.

Solution,

We know that according to the law of conservation of momentum, the initial momentum is equal to the final momentum.

m_1u=m_2v

m_2=\dfrac{m_1u}{v}

m_2=\dfrac{2200\times 3.6}{3.1}

m_2=2554.83\ kg

Therefore, the maximum mass of grain that it can accept is 2554.83 kg. Hence, this is the required solution.

7 0
3 years ago
A 45 g bullet strikes and becomes embedded in a 1.55 kg block of wood placed on a horizontal surface just in front of the gun. I
zimovet [89]

Answer:

299.51 m/s

Explanation:

m = mass of the bullet = 45 g = 0.045 kg

M = mass of the block = 1.55 kg

v = muzzle speed of the bullet

V = speed of bullet-block combination after the collision

μ = Coefficient of friction between the block and the surface = 0.28

d = distance traveled by the block = 13 m

V' = final speed of the bullet-block combination = 0 m/s

acceleration of the bullet-block combination due to frictional force is given as

a = - μg

using the kinematics equation

V'² = V² + 2 a d

0² = V² + 2 (- μg) d

0 = V² - 2 (μg) d

0 = V² - 2 (0.28) (9.8) (13)

V = 8.45 m/s

Using conservation of momentum for collision between bullet and block

mv = (M + m) V

(0.045) v = (1.55 + 0.045) (8.45)

v = 299.51 m/s

6 0
3 years ago
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