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serg [7]
2 years ago
13

Could anyone help me out ?

Physics
2 answers:
Delicious77 [7]2 years ago
4 0

density = mass/volume = 100kg/10ml = 10kg/ml

voluime = mass/density = 50g/2 g/ml = 25 ml

mass = density x volume = 2x55 = 110 kg

CaHeK987 [17]2 years ago
4 0

All of these are answered by using one formula . . . the definition of Density.  Density = Mass / Volume .  For each problem, substitute the given numbers into that formula, and solve it for the unknown number.  (Don't forget to keep the correct units all the way through each one.)

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A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW
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Answer:

Option D 3.9

Explanation:

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What is the acceleration of a block on a ramp inclined 35o to the horizontal if µk = 0.4?
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\sum F = ma

We should consider two different directions: the direction perpendicular to the inclined plane and the direction parallel to it. Let's write the equations of the forces along the two directions, decomposing the weight of the object (mg):

mg \sin \theta - \mu_K N = ma (parallel direction) (1)
mg \cos \theta - N =0 (perpendicular direction) (2)
where
\theta=35^{\circ} is the angle of the inclined plane, N is the normal reaction of the plane, \mu_K N is the frictional force, with \mu_K=0.4 being the coefficient of friction.

From eq.(2), we find
N=mg \cos \theta
and if we substitute into eq.(1), we can find the acceleration of the block:
mg \sin \theta - \mu_k mg \cos \theta = ma
from which
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7 0
3 years ago
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