Answer:
60 to 80%
Explanation:
For maximum benefit, the heart rates during exercise regimes should be between 60 to 80% of an individual's maximum heart rate.
The maximum heart rate varies from individuals to individuals and largely depends on age. It is calculated by subtracting one's age from 220. For example, a person that is 40 years old would have a maximum heart rate of;
220 - 40 = 180 beats per minute.
Such a person's heart rates during exercises should be between 108 and 144 beats per minute for maximum benefits.
Glaciers begin with snowfall building up and __________________ the ice. (Choose the best answer)
Group of answer choices
compacting
exposing
freezing
Answer:
compacting
Explanation:
i don't think there is very much explanation, the snow falls and compacts the ice to become giant lol
Tom skis at an average speed of 5 m/s. How many mins does it take for Tom to ski 4050 m.
3. Electrons are the only part of an atom that can be transferred between materials. True or
False?
Answer:
True
Explanation:
Electrons can be transferred between materials as in chemical reactions solid substances lose electrons while other elements gain electrons to balance the electrons in reaction.It occurs by conduction,polarization and friction.
find the factor of the number 1.30
1 3/10 because 130 is greater than 100 we have simplified this fraction even further to a mixed fraction.
Please provide positive integer to calculate.
An inclined plane is set at an angle of 29 degrees above horizontalWhat is the acceleration of a 420 g block of ice sliding down the inclined plane? Assume no friction
The net force parallel to the plane is
∑ F = m g sin(29°) = m a
where
m = mass of the block
g = magnitude of the acceleration due to gravity, 9.8 m/s²
a = mag. of acceleration of the block
where we take the direction of the block's sliding down the plane to be positive. Then
a = g sin(29°) ≈ 4.8 m/s²
if the bill is vetoed
Answer:
Explanation:
A vote is maybe a vote
8 A small smooth object slides from rest down a smooth inclined plane inclined at
30° to the horizontal. What is (i) the acceleration down the plane, (ii) the time
to reach the bottom if the plane is 5 m long?
The object is now thrown up the plane with an initial velocity of 15 ms -1.
(iii) How long does the object take to come to rest? (iv) How far up the plane has
the object then travelled?
Answer:
(i) The acceleration of the object down the plane is approximately 4.9 m/s²
(ii) The time it takes for the object to reach the bottom is approximately [tex]1.\overline{428571}[/tex] seconds
(iii) The time it takes the object to come to rest is approximately 1.030636 seconds
(iv) The object has travelled past the top of the plane by time it comes to rest
Explanation:
(i) The given parameter for the objects motion are;
The angle of inclination of the plane with the horizontal, θ = 30°
The length of the plane, s = 5 m
Let "a" represent the acceleration down an inclined plane, due to the acceleration under gravity "g" we have;
a = g × sin(θ)
Where;
g = The acceleration due to gravity ≈ 9.8 m/s²
∴ a ≈ 9.8 m/s² × sin(30°) = 9.8 m/s² × 0.5 = 4.9 m/s²
The acceleration of the object down the plane, a ≈ 4.9 m/s²
(ii) The time it takes for the object to reach the bottom, can be found from the following kinematic equation of motion;
s = u·t + 1/2·a·t²
Where;
s = The length of the inclined plane = 5 m
u = The initial velocity of the object = 0 m/s
t = The time of motion of the object (Here the time to reach the bottom of the plane)
a = The acceleration of the object = 4.9 m/s²
Therefore, we have;
5 = 0 × t + 1/2 × 4.9 × t² = 2.45·t²
t² = 5/2.45 = 100/49
t = √(100/49) = 10/7 = [tex]1.\overline{428571}[/tex]
The time to reach the bottom of the plane = t = [tex]1.\overline{428571}[/tex] seconds
(iii) When the object is thrown up the plane with an initial velocity of 15 m/s, the time, "t", it takes the object to come to rest is found by the following kinematic equation of motion;
v² = u² - 2·a·s
Therefore, we have;
v² = 15² - 2 × 4.9 × 5 = 176
v = √176 = 4·√11
The velocity of the object at the top of the plane = v = 4·√11 m/s
The time it takes the object to come to rest after reaching the top of the plane = The time it takes the object (projectile) to reach maximum height
[tex]t_m = \dfrac{v_i \cdot sin(\theta _i )}{g}[/tex]
Where;
[tex]t_m[/tex] = The time it takes the object to reach maximum height
[tex]v_i[/tex] = The initial velocity of the object at the top of the inclined plane = 4·√11 m/s
[tex]\theta _i[/tex] = The initial angle of inclination of the path of the object with the horizontal = 30°
Therefore, we have;
[tex]t_m = \dfrac{4 \times \sqrt{11} \times sin(30^{\circ} )}{9.8} = \dfrac{10 \cdot \sqrt{11} }{49} \approx 0.67686[/tex]
The time it takes the object to come to rest after reaching the top of the plane = The time it takes the object to reach maximum height = [tex]t_m[/tex] ≈ 0.67686 seconds
The time it takes the object to reach the top of the plane, [tex]t_{top}[/tex], is given from the kinematic equation of motion, v = u - a·t, as follows
v = u - a·t
∴ t = (u - v)/a
[tex]t_{top}[/tex] = (15 - 4·√11)/4.9 ≈ 0.353776
The time it takes the object to reach the top of the plane = [tex]t_{top}[/tex] ≈ 0.353776 s
The total time it takes the object to come to rest, ∑t = [tex]t_m[/tex] + [tex]t_{top}[/tex]
∴ ∑t ≈ 0.67686 + 0.353776 = 1.030636
The time it takes the object to come to rest = ∑t ≈ 1.030636 seconds
(iv) The distance up the plane the object reaches, "s", is given by the following kinematic equation;
s = u·t - 1/2·a·t²
Therefore, we have;
s = 15 × 15/4.9 - 1/2 × 4.9 × (15/4.9)² ≈ 22.959 m
However, the plane is 5 meters long, therefore, the object goes further than the top of the plane.
I feel death among us
same but who knows how 2021 might go
Answer:
same....
Explanation:
Wanna be friends?
Which of these is one of six most common elements found in the human body??
Answer: Oxygen
Explanation: Oxygen is the most common element in the human body. It makes up 65% of the body.
Two positive charges 12×10^-6C and 8×10^-6 are 10cm apart. Find the workdone in bringing them 4cm together
Answer:
W = 5.76 J
Explanation:
Given that,
Charge 1, [tex]q_1=12\times 10^{-6}\ C[/tex]
Charge 2, [tex]q_2=8\times 10^{-6}\ C[/tex]
The distance between charges is 10 cm.
Initial distance = 10 cm = 0.1 m
Final distance = 10 cm - 4 cm = 6 cm = 0.06 m
We need to find the work done in bringing the 4 cm together.
We know that,
Work done = change in kinetic energy
[tex]W=kq_1q_2(\dfrac{1}{r_2}-\dfrac{1}{r_1})\\\\\text{Put all the values}\\\\W=9\times 10^9\times 12\times 10^{-6}\times 8\times 10^{-6}(\dfrac{1}{0.06}-\dfrac{1}{0.1})\\\\W=5.76\ J[/tex]
So, the required work done is 5.76 J.
Adjetivo utilizado para calificar la componente de la aceleración en la dirección del movimiento de un punto que se mueve según una circunferencia.
10 letras
Answer:
Tangencial.
Explanation:
El adjetivo empleado es tangencial, cuya longitud es diez caracteres. La aceleración tangencial es el componente del vector aceleración que es paralelo a la dirección del vector velocidad de un punto que se mueve sobre una circunferencia.
La aceleración tangencial tiene la función de cambiar la magnitud del vector aceleración.
An angle of refraction is the angle between the refracted ray and the
o incident ray.
o normal.
O medium.
O boundary
Answer:
b) normal
Explanation:
The angle of refraction (transmission) Θt is the angle between the refracted ray and the normal N'. 2. When a light ray hits a surface normally, the angle between the incident ray and the normal is 0, so Θi = 0. Since the angle of reflection equals the angle of incidence, Θr= 0.
The angle of refraction is the angle between the refracted ray and the normal, which is option B.
What is the angle of refraction?When light travels from one medium to another medium with a different refractive index, it changes direction.
The angle of refraction is the angle between the refracted ray and the normal, which is an imaginary line perpendicular to the boundary between the two media at the point of incidence. The incident ray is the incoming ray of light that strikes the boundary between the two media.
The medium refers to the substance through which light is passing, and the boundary is the surface separating the two media.
However, the angle of refraction is not related to the incident ray or the boundary, but rather the norm.
Thus, the correct answer would be an option (B) normal.
To learn more about the angle of refraction click here:
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The human body can store excess animo acids as a protein source ?
Answer:
The thermic effect (TEF) is greater for protein compared to carbohydrate and fat. The body can store excess amino acids for later use. The protein-sparing effect spares the utilization of protein as an energy source and allows it to be used for more important metabolic functions.
During a goal-line stand, a 112-kg fullback moving eastward with a speed of 6 m/s
collides head-on with a 120-kg lineman moving westward with a speed of 8 m/s.
The two players collide and stick together, moving at the same velocity after the
collision. Determine the post-collision velocity of the two players.
Answer:
-1.24 m/s
Explanation:
Total momentum before collision = total momentum after collision
Total momentum before collision = (mass of full back * velocity of fullback) + (mass of lineman * velocity of line man).
Mass of full back = 112 kg, mass of line bag = 120 kg, velocity of full back 6 m/s (east), velocity of line back = -8 m/s (west). Hence:
Total momentum before collision = (112 * 6) + (120 * -8) = 672 - 960 = -288 kgm/s
The total momentum after collision = (mass of full back + mass of line back) * velocity after collision.
Let velocity after collision be v, hence:
The total momentum after collision = (112 + 120)v = 232v
Total momentum before collision = total momentum after collision
-288 = 232v
v = -288 / 232
v = -1.24 m/s
Therefore after collision, the two players would move at a velocity 1.24 m/s west (the same direction as the lineman).
How would the gravitational force between the earth and the moon change if the moon had half the mass?
The moon's gravity, combined with the waltz of Earth and the moon around their center of mass, forces the oceans into an oval shape, with two simultaneous high tides. ... If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it.
A boy pushed horizontally a 3.5 kg plastic chair across the slippery floor. If
the acceleration of the plastic chair is 2.2 m/s2 to the left, what is the net force
exerted on the plastic chair?
Answer:
7.7 N to left or -7.7 N
Explanation:
slippery floor means no frictional force
Equation for force
F = m * a , where F is force, m is mass in kg, and a is acceleration in m/s²
F = 3.5 * -2.2 m/s² = -7.7 N
Help plz!! I’ll give brainlist!! I need it fast plz
Answer:
1.A
2.E
3.C
4.i think A
Explanation:
a 20 of of ice at 0c is dropped into water at boiling point, specific heat capacity of water =4200 J/kg•c, sepesific latent heat of fusion (Lf) =3.3x10^(5) J/kg calculate the amount of heat energy needed to complete the previous conversion
Answer:
15 KJ
Explanation:
The quantity of heat (Q) required is given as:
Q = mcΔθ + mL
where m is the mass of ice, c is its specific heat capacity, L is its specific latent heat andΔθ is the change in temperature.
Given: m = 20g, temperature of ice = 0[tex]^{o} C[/tex], specific heat capacity of water = 4200 J/kg[tex]^{o} C[/tex], latent heat of fusion of ice = 3.3 x 10^(5) J/kg, temperature of water = 100[tex]^{o} C[/tex].
Q = m (cΔθ + L)
= 0.02(4200 x (100) + 330000)
= 0.02(420000 + 330000)
= 0.02 (750000)
Q = 15000
Q = 15000 Joules
Q = 15KJ
The quantity of heat needed to complete the conversion is 15 KJ.
When a wave strikes and object and bounces off . ( example echo)
A. Medium
B. Refraction
C.Reflection
D. Interference
Answer:
C. reflection
Explanation:
reflection occurs when a wave strikes an object and bounces off of it
When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
This is similar to what happens when sound waves strike a surface and bounce back, resulting in an echo.
Reflection occurs when a wave encounters a boundary or an obstacle and changes direction, returning back into the medium it came from.
The angle of incidence (the angle at which the wave strikes the surface) is equal to the angle of reflection (the angle at which the wave bounces off the surface).
Therefore, When a wave strikes an object and bounces off, it is called reflection.
Hence, the correct option is C.
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Distance is a __________ quantity, as it has no direction, only magnitude
Answer:
-scalar
Explanation:
-A scalar is any quantity that has a magnitude, but no direction
-quantities with no specified direction.
hope it helps:)
Which of the following are not correctly balanced reactions?
Check all that apply.
A. C + Cl2 → CC14
OB. 2K + Br2 + 2KBr
O C. Mg + FeO →2Fe + Mgo
D. C + 02 → CO2
Answer:
B. 2K + Br2 + 2KBr
D. C + 02 → CO2
Explanation:
In balancing a chemical reaction, the number of atoms on both sides of the expression must be the same in order to obey the law of conservation of mass.
According to the law of conservation of mass, in a chemical reaction, matter is neither created nor destroyed.
So, let us investigate:
Number of atoms
Reactants Products
K 2 2
Br 2 2
C + 0₂ → CO₂
C 1 1
O₂ 2 2
We see that for both equations, the number of atoms on both sides of the expression is the same.
If the air pressure measures is 3 atm. How many mb of pressure is in the air?
Answer:
3
Explanation:
If there is 3 at the moment (atm) is the same as might be (mb) in the air.
Determine the acceleration of the block
if the coefficient of static friction is 0.343.
Answer:
a = 1.49m/s²
Explanation:
Find the diagram attached
According to Newton's second law of motion
\sum Fx = ma
Fm - Ff = ma
Fm is the moving force
Ff is the frictional force
Fm = Wsin theta
Ff = μR = μWcos theta
Wsin theta - μWcos theta = ma
W is the weight = 50.1 * 9.8 = 490.98N
theta is the angle of inclination = 27.2°
μ is the coefficient of friction = 0.343
m is the mass = 50.1kg
a is the acceleration
Substitute into the formula as shown;
Wsin theta - μWcos theta = ma
490.98sin27.2° - 0.343(490.98)cos 27.2° = 50.1a
224.423 - 149.78 = 50.1a
74.64 = 50.1a
a = 74.64/50.1
a = 1.49m/s²
Hence the acceleration of the block is a = 1.49m/s²
How would the gravitational force between the earth and the moon change if the moon had twice the mass?
Explanation: The moon's gravity, combined with the waltz of Earth and the moon around their center of mass, forces the oceans into an oval shape, with two simultaneous high tides. ... If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it.
You drop a bowling ball and it falls with an acceleration of 10 m/s2. The ball has a mass of 5 kg. How much force is causing the ball to fall?
Explanation:
Given
acceleration (a) = 10 m/s²
mass (m) = 5 kg
Force (F) = ?
We know
F = m * a
= 5 * 10
= 50 Newton
The force is 50 N
Hope it will help :)
Answer:
[tex]\boxed {\boxed {\sf 50 \ Newtons }}[/tex]
Explanation:
Force can be found using the following formula.
[tex]F=m*a[/tex]
where F is the force, m is the mass, and a is the acceleration.
1. Define Values
We know the acceleration of the bowling ball is 10 m/s² and the mass is 5 kilograms.
[tex]a= 10 \ m/s^2 \\m= 5 \ kg[/tex]
2. Calculate Force
Substitute the values into the formula.
[tex]F= 5 \ kg * 10 \ m/s^2[/tex]
Multiply.
[tex]F= 50 \ kg*m/s^2[/tex]
1 kilogram meter per square second is equal to 1 Newton. Our answer of 50 kg*m/s² is equal to 50 N[tex]F=50 \ N[/tex]
The force causing the ball to fall is 50 Newtons
Why cloth and leather are used to make safety clothing for people who work with heat. A.they are both good sources of heat. B they both can produce electrical energy C they both can absorb light energy. D they are both poor conductors of heat
Answer: D
Explanation:
When you walk into a dark room and turn the light on, do the electrons travel all the way from the switch to the light?
Answer:
Yes
Explanation:
This is because for the light to come on, electric current has to flow through it which is due to electron motion. As the electrons move through the light, it turns electrical energy to light energy, so the light comes on.
Question 2 (2 points)
Which of the following is a true statement about mass and weight? (2 points)
a
Mass is a measure of how much matter an object has, while weight is a measure of
how much space the object takes up.
Mass will not change based on location, while weight will change based on
gravitational pull
b
Mass is a measure of a gravitational pull on an object, while weight is a measure of
how much matter is an object has,
Mass is proportional to the force of gravity, while weight is proportional to the
amount of mass,
d
Answer:
B. Mass will not change based on location, while weight will change based on gravitational pull.
Answer:
B
Explanation:
took the test
A test pilot flies with an acceleration of 5 g. What is his acceleration in meters
per second squared?
A. 5 m/s2
B. 9.8 m/s2
C. 49 m/s2
D. 14.8 m/s2
Answer:
C. 49 m/s^2
Explanation:
1 G = 9.81 m/s^2
so 5 * 9.81 = 49.05
or C. 49 m/s^2
Which of the following is an example of Kinetic to Electrical energy
conversion?
A. Toaster
B. Bicycle
C. Ceiling fan
D. Generator