Elements in Group<br> are common alkaline earth metals.<br> Answer here

The quantity of heat from a chemical reaction comes from

Tomtit [17]

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius

3 0

4 years ago

A punter wants to kick a football so that the football has a total flight time of 3.7 s and lands 56m away (measured along the g

Irina18 [472]

The maximum height is 16.8 m

Explanation:

In order to find the maximum height reached by the football, we can just analyze its vertical motion.

The vertical motion of the ball is a free fall motion, affected only by the force of gravity. So it is a uniformly accelerated motion, and we can use suvat equations.

First of all, we notice that the motion of the ball is symmetrical, so the time taken to reach the maximum height is equal to the time needed to fall down: Since the total time of flight is

T = 3.7 s

It means that the time to reach the maximum height is

$t=\frac{T}{2}=\frac{3.7}{2}=1.85 s$

We can now find the maximum height reached using the equation:

$s=vt-\frac{1}{2}at^2$

Where:

s is the vertical displacement (the maximum height)

v = 0 is the velocity of the ball at the maximum height

t = 1.85 s is the time

$a=g=-9.8 m/s^2$ is the acceleration of gravity

Solving for s,

$s=-\frac{1}{2}(-9.8)(1.85)^2=16.8 m$

Learn more about free fall motion here:

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6 0

3 years ago

An green hoop with mass mh = 2.8 kg and radius rh = 0.17 m hangs from a string that goes over a blue solid disk pulley with mass

vladimir2022 [97]

The mass of the hoop is the only force which is computed by:F net = 2.8kg*9.81m/s^2 = 27.468 N
the slow masses that must be quicker are the pulley, ring, and the rolling sphere.
The mass correspondent of M the pulley is computed by torque τ = F*R = I*α = I*a/R F = M*a = I*a/R^2 --> M = I/R^2 = 21/2*m*R^2/R^2 = 1/2*m
The mass equal of the rolling sphere is computed by: the sphere revolves around the contact point with the table. So using the proposition of parallel axes, the moment of inertia of the sphere is I = 2/5*mR^2 for spin about the midpoint of mass + mR^2 for the distance of the axis of rotation from the center of mass of the sphere. I = 7/5*mR^2 M = 7/5*m
the acceleration is then a = F/m = 27.468/(2.8 + 1/2*2 + 7/5*4) = 27.468/9.4 = 2.922 m/s^2

6 0

3 years ago

When two stars are bound together gravitationally and orbit a common mass, they're known as

garik1379 [7]

D. Binary Stars

Well, galaxies are not stars at all rather they are collection of stars, nebulae, globular clusters and stuff like this.
Meteoroids are something entirely different.
Constellations are the pattern of stars.
So, "Binary Stars" is the Right One.

3 0

3 years ago

Ben, a psychology student, decides to examine masking behaviors, now that more people are vaccinated. He goes to his local groce

olga nikolaevna [1]

Ben as a psychology student is most likely conducting a <u>behavioral</u> study.

What is psychology?

Psychology can simply be defined as the study of human mind, conscious and unconscious, thoughts and feelings.

In conclusion, Ben as a psychology student is most likely conducting a behavioral study.

Some few branches of psychology are:

Educational psychology
Cognitive psychology
Behavioral psychology
Counseling psychology
Forensic psychology
Clinical psychology

Learn more about psychology:

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8 0

3 years ago

Elements in Group are common alkaline earth metals. Answer here