The data showed that there was no significant difference in healing times between the two groups, so the researcher concluded that calcium intake has no effect on bone healing time. Why is the conclusion of the researcher not justified?

Answers

Answer 1

Answer:
Without knowing the structure and methods of his study,
and the methods of selecting the population sample, we
can't tell whether his conclusion is justified or not.

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angie, brad, and carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. one bullet bounces off the steel block while the second becomes embedded in the wood block.

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The question didnt fit in the are provided

What does the doppler effect tell astronomers about the universe

Answers

The doppler effect has red and blue shifts. A red shift means something is moving farther away, and a blue shift means it is moving closer. The universe has a red shift, and since a red shift means that it is moving farther away, this tells astronomers that the universe is still expanding.

A 0.50 kilogram ball is held at a height of 20 meters. What is the kinetic energy of the ball when it reaches halfway after being released?

Answers

(M G H)=(0.5 x 9.8 x 10) = 49 joules.

A mass of 1.0 kg is initially held in place on a ramp of angle 45o at height of 20. meters above the ground. The mass is released and slides to the bottom of the ramp (h=0). There is friction between the mass and the ramp. At the bottom of the ramp, the object has a speed of 10. m/s. The thermal energy was generated by the friction as the mass slides down the ramp is closest to which value?

Answers

Answer:

The thermal energy generated by the friction as the mass slides down the ramp is $\bf{146~J}$ .

Explanation:

Given:

The mass of the object is, $m = 1.0~kg$

The angle of the ramp is, $\theta = 45^(0)$

The initial height of the object on the ramp is, $h = 20~m$

The final velocity of the object is, $v = 10~m/s$

When the object is at rest on the ramp, its total energy is potential energy. When it moves down the ramp its kinetic energy is increased and potential energy is decreased and a part of its energy is lost to overcome the force of friction. Finally, when it is at the bottom of the ramp, its total energy becomes only kinetic energy.

The total energy of the object at a height $20~m$ on the ramp is given by

$E_(1) &=& mgh\n~~~~&=& (1.0~kg)(9.8~m/s^(2))(20~m)\n~~~~&=& 196~J$

When the object is at the bottom of the ramp, its total energy is given by

$E_(2) &=& (1)/(2)mv^(2)\n~~~~&=& (1)/(2)(1.0~kg)(10~m/s)^(2)\n~~~~&=& 50~J$

So, the energy that is lost as thermal energy is given by

$E &=& E_(1) - E_(2)\n~~~~&=& 196~J - 50~J\n~~~~&=& 146~J$

State 2 applications of convection in daily life

Answers

Final answer:

Convection is a process that helps distribute heat, notably in daily applications such as heating systems and cooking. It involves the movement of heat through fluids, where hotter parts become less dense and rise, creating a current.

Explanation:

Convection is a significant process in our daily lives that enables the transfer of heat in fluids (liquids and gases) from one place to another.

One common application of convection is seen in Heating Systems. For instance, in a radiator, hot water or steam travels through the system, heats the surrounding air, and this hot air rises, creating a convection current that distributes the warmth throughout a room.

Another prime example of convection at work is Cooking. When you boil water or cook in a pot, the heat from the stove heats up the pot which then heats the water at the bottom. This hot water rises, pushing the cooler water to the bottom where it too gets heated, thus creating a convection current.

Learn more about Convection here:

brainly.com/question/33283389

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An 8-N force is applied to a 2-kg box to accelerate it to the right across a table. The boxencounters a force of friction of 5 N. What is the acceleration of the object?
(1 Point)
4 m/s2
2.5 m/s2
1.5 m/s2
1 m/s2

Answers

Answer:

1.5

Explanation:

resultant force=8-5=3N

using f=ma

a=f/m

=3/2

=1.5

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Sean climbs a tower that is 71.3 m high to make a jump with a parachute. The mass of Sean plus the parachute is 81.4 kg. If U = 0 at ground level, what is the potential energy of Sean and the parachute at the top of the tower?