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3 years ago

Which product forms from the synthesis reaction between calcium (Ca) and

Physics

2 answers:

cestrela7 [59]3 years ago

5 0

Answer:

CaCl2

Explanation:

Ganezh [65]3 years ago

4 0

Answer:

its a! the answer is a

Explanation:

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A ball of mass 0.3 kg is released from rest at a height of 8 m. How fast is it going when it hits the ground? (Gravity being equ

docker41 [41]

Answer:

Explanation:

Mass doesn't matter here because when something is falling, gravity plays fairly; an elephant falls at the same rate of acceleration as does a feather. What DOES matter is everything pertinent to the y-dimension of free-fall:

a = -9.8 m/s/s

v₀ = 0 (since the ball was held before it was dropped)

v = ??

Δx = -8 m (negative because the ball drops this far below the point from which it was released).

Putting all this together in one equation:

v² = v₀² + 2aΔx and filling in this equation:

v² = (0)² + 2(-9.8)(-8) and

v² = 156.8 so

v = 12.5 which rounds to 13 if you're using 2 sig figs, and rounds to 10 if you're only using 1 (which you should be, according to the way the numbers have been given in this problem)

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3 years ago

A frame hanging on a wall is held by two cables. The tension in each cable is 30 N, and the cables make an angle of 45° with the

Dimas [21]

Answer: option D) 42.4 N

The weight of the frame is balanced by the vertical component of tension.

W = T sin θ + T sin θ = 2 T sin θ

The tension in each cable is T = 30 N

Angle made by the cables with the horizontal, θ = 45°

⇒ W = 2×30 N × sin 45° = 2 × 30 N × 0.707 = 42.4 N

Hence, the weight of the frame is 42.4 N. Correct option is D.

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4 years ago

Atoms bond by sharing or transferring electrons in their ______ Shell.

Eduardwww [97]

The answer is B bc only the valence shell holds electrons

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3 years ago

A concrete block of mass 35kg is pulled along a horizontal floor with the aid of a rope inclined at an angle of 30⁰ to the horiz

TEA [102]

Answer:

C. 211.5 N

Explanation:

We included a free body diagram representation of the concrete block. The equation of equilibrium in the x-direction:

$\Sigma F_{x} = P\cdot \cos \alpha -\mu_{k}\cdot N = m\cdot a$ (1)

$\Sigma F_{y} = N + P\cdot \sin \alpha -m\cdot g = 0$ (2)

Where:

$P$ - External force exerted on the block, measured in newtons.

$N$ - Normal force from the ground to the block, measured in newtons.

$\alpha$ - Direction of the external force, measured in sexagesimal degrees.

$\mu_{k}$ - Kinetic coefficient of friction, dimensionless.

$m$ - Mass of the concrete block, measured in kilograms.

$g$ - Gravitational acceleration, measured in meters per square second.

$a$ - Net acceleration of the concrete block, measured in meters per square second.

The minimum force to move block occurs when net force is zero, from (2) we get that the normal force is:

$N = m\cdot g -P\cdot \sin \alpha$

And by applying this formula in (1), we get that the external force is:

$P\cdot \cos \alpha - \mu_{k}\cdot (m\cdot g -P\cdot \sin \alpha) = m\cdot a$

$P\cdot \cos \alpha -\mu_{k}\cdot m\cdot g +\mu_{k}\cdot P\cdot \sin \alpha = 0$

$P\cdot (\cos \alpha +\mu_{k}\cdot \sin \alpha)=\mu_{k}\cdot m\cdot g$

$P = \frac{\mu_{k}\cdot m\cdot g}{\cos \alpha +\mu_{k}\cdot \sin \alpha}$

If we know that $\mu_{k} = 0.75$ , $m = 35\,kg$ , $g = 10\,\frac{m}{s^{2}}$ and $\alpha = 30^{\circ}$ . then the external force is:

$P = \frac{(0.75)\cdot (35\,kg)\cdot \left(10\,\frac{m}{s} \right)}{\cos 30^{\circ}+0.75\cdot \sin 30^{\circ}}$

$P \approx 211.518\,N$

The correct answer is C.

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3 years ago

The organ procurement and transplant network (OPTN) was established by?

damaskus [11]

The answer to that would be A. the national organ transplant Act of 1984 the goals of the OPTN are to increase the number of and access to transplants, improve survival rates after transplantation, and to promote patient safety and efficient management of the system.

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4 years ago

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