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2 years ago

Please help, I am stumped.

Physics

2 answers:

ehidna [41]2 years ago

6 0

30 is the correct answer your looking for

Ivahew [28]2 years ago

4 0

Answer: A) 30 grams

Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants.

mass of reactants= mass of antacid + mass of water= 30 g+ 50 g= 80 g

Given : Mass of product = 50 g

But mass of products should be equal to mass of reactants = 80 g

Thus mass of another product= (80-50)g = 30 g.

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PolarNik [594]

Answer:

R=m*g-∀fl*g*l3

Explanation:

An iron block of density rhoFe and of volume l 3 is immersed in a fluid of density rhofluid. The block hangs from a scale which reads W as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is

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rho=m/l3

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2 years ago

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2 years ago

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1 year ago

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Montano1993 [528]

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2 years ago

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Two spheres have identical charges and are 75 cm apart. the force between them is +0.30 n. what is the magnitude of the charge o

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Answer:

$4.33\cdot 10^{-6}C$ , charges are both positive or both negative

Explanation:

The electrostatic force between the two spheres is given by

$F=k\frac{q_1 q_2}{r^2}$

where

k is the Coulomb's constant

q1 and q2 are the charges on the two spheres

r is the distance between the centres of the two spheres

In this problem, we have

$F=+0.30 N$ is the force

$r=75 cm=0.75 m$ is the distance between the spheres

$q_1 =q_2 =q$ because the two spheres have identical charge

Solving the formula for q, we find

$q=\sqrt{\frac{Fr^2}{k}}=\sqrt{\frac{(+0.30 N)(0.75 m)^2}{9\cdot 10^9}}=4.33\cdot 10^{-6}C$

And the two charges have the same sign (so, both positive or both negative), since the sign of the force is positive (+0.30 N), so it is a repulsive force.

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2 years ago