Answer:
400×3=1200km
Explanation:
distance=velocity ×time
If the half life of a decaying isotope is 10 years, which statement is true after 8 years
Answer:
is suppoesd to say after 20 yrs
Explanation:
2. A child swings back and forth on a swing with no friction or air resistance between points X and Z, as shown. Point Y is the lowest point in the swing, where height is zero. Which of the following is equal to the kinetic energy of the child at point Y?
(A) The kinetic energy of the child at point X.
(B) The kinetic energy of the child at point Z.
(C) The potential energy of the child at point Y.
(D) The potential energy of the child at point Z.
Answer:
c
Explanation:
4) The object that changes its position relative to a fixed point with time is called ..
A 150-newton force, applied to a wooden crate at an angle of 30° above the horizontal, causes the crate to travel at constant velocity across a horizontal wooden floor.
1. Calculate the magnitude of the normal force exerted by the floor on the crate. [Show all work, including the equation and substitution with units.]=
The mechanical equilibrium condition allows to find the value of the normal for the body is:
The normal is: N = 23 NEquilibrium equation.Newton's second law establishes a relationship between the force, the mass and the acceleration of bodies, in the special case that the acceleration is zero, it is called a mechanical equilibrium condition.
∑ F = 0
A free body diagram is a diagram of the forces without the details of the bodies, in the attachment we can see this diagram, let's write the equilibrium condition for each axis.
x- axis
Fₓ -fr = 0
y-axis
F_y + N – W =0
Let's use trigonometry to find the components of the applied force.
Cos 30= [tex]\frac{F_x}{F} [/tex]
sin 30 = [tex]\frac{F_y}{F } [/tex]
Fₓ = F cos 30
[tex]F_y[/tex] = F sin 30
The weight of a body is the mass times the acceleration due to gravity.
W = m g
Let's substitute.
F sin 30 + N – m g = 0
N= m g – F sin 30
Let's calculate.
N = m 9.8 – 150 sin 30
N = m 9.8 - 75
To finish the calculation, the mass of the body must be known, suppose a value of 10 kg.
N=10 9.8 -75
N = 23N
In conclusion using the mechanical equilibrium condition we can find the value of the normal for the body is:
The normal is N = 23 NLearn more about the mechanical equilibrium condition here: brainly.com/question/12804448
How does a physicist define work? a force applied for a certain length of time a force applied over a distance power applied for a certain length of time power applied to something over a distance
Answer:
Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. ... To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd.
Explanation:
Definition of work in physics
A measure of energy expended in moving an object; most commonly, force times distance is work.HELP!
Which of the following is true about having too little body fat?
Too little body fat can help increase your metabolism
Too little body fat is a health risk
Too little body fat can cause a heart attack
Too little body fat is good for your overall health
Which of the following is a Myth about fat loss?
Most people who are high in body fat eat too much
Any exercise that burns calories will cause the body's general fat deposit to decrease
You can lose body fat over time with regular physical activity if your calorie intake is less than calories burned in a given day
You can spot-reduce by exercising a specific body part to lose fat in that area
Which of the following statements is true about Metabolism?
Your metabolism speeds up naturally as you get older
Your basal metabolism is the amount of energy (calories) your body uses just to keep you living.
You can never speed up or slow down your body's metabolism
Your metabolism is not affected your heredity, age, and maturation
Answer:
too little body fat is a health risk
Explanation:
IF you do not have enough body fat you can have bad things happen to you
Two positive charges of 20 micro coulomb and 100 micro coulomb and the distance between them is 150cm.What will be the electrical force of repulsion between these charges?
Answer:
0.8 N
Explanation:
From coulomb's law,
Formula:
F = kqq'/r²........................ Equation 1
Where F = Force of repulsion, k = coulomb's constant, q = first positive charge, q' = second positive charge, r = distance between the charge.
Given: q = 20 μC = 20×10⁻⁶ C, q' = 100 μC = 100×10⁻⁶ C, r = 150 cm = 1.5 m.
Constant: k = 9×10⁹ Nm²/C²
Substitute these values into equation 1
F = (20×10⁻⁶ )( 100×10⁻⁶)(9×10⁹)/1.5²
F = 1800×10⁻³/2.25
F = 1.8/2.25
F = 0.8 N
Why are the oceans movements along the What do ocean waves have in common with the sound and light
Answer:
Oceanic currents an waves are in motion due to energy of wind.
Explanation:
When the wind blows across the ocean water ts creates a pull and push effect. It pulls the top layers of water and creates a frictional drag force that leads to the movement of water molecules and appears that the surface is moving. The movement can be seen in the form of surface oceanic currents and waves that are found through the entire globe. The ocean waves and currents carry with them the energy from one place to another.
How can we use thermal energy to our advantage?
Answer:
One of the primary advantages of thermal power is that the generation costs are extremely low. No fuel is needed to generate the power, and the minimal energy needed to pump water to the Earth's surface can be taken from the total energy yield.
Explanation:
Explanation:
heating system warming homes and other buildings is an abvous way that thermal energy can be used two common types of home heating system are hot water and warm air
static_______
sliding______
rolling_______
fluid_________
Answer:
a car
A sled sliding across snow or ice.
a ball down a hill
mercury
Explanation:
A ball is thrown with an initial velocity of u=(10i +15j) m/s. Whan it reaches the top of it trajectory neglecting air resistance . What is its valocity ?What is acceleration ?
Answer:
v = (10 i ^ + 0j ^) m / s, a = (0i ^ - 9.8 j ^) m / s²
Explanation:
This is a missile throwing exercise.
On the x axis there is no acceleration so the velocity on the x axis is constant
v₀ₓ = 10 m / s
On the y-axis velocity is affected by the acceleration of gravity, let's use the equation
v_y = [tex]v_{oy}[/tex] - g t
[tex]v_{y}^2 = v_{oy}^2 - 2 g (y - y_o)[/tex]
at the highest point of the trajectory the vertical speed must be zero
v_y = 0
therefore the velocity of the body is
v = (10 i ^ + 0j ^) m / s
the acceleration is
a = (0 i ^ - g j⁾
a = (0i ^ - 9.8 j ^) m / s²
The frequency of a sound wave is 457 Hz. What is the period?
a
0.0032 s
b 0.078 s
C 0.0010 s
d 0.0022 s
The period of the sound wave having frequency of 457Hz is 0.0022 s.
What is frequency?
The frequency refers to the number of waves that pass a fixed point in unit time.
What is the relation between frequency and time period?
Time period is equal to the reciprocal of frequency.
i.e. T = 1 / f
So, The period of the sound wave having frequency of 457Hz will be
T = 1/457
∴ T = 0.002188 s
Now , rounding to the nearest value we get , 0.0022 s
Thus , The period of the sound wave having frequency of 457Hz is 0.0022 s.
Learn more about frequency here -
https://brainly.com/question/254161
#SPJ2
A small 10.0 g ball is held to a slingshot
that is stretched 6.0 cm. The spring
constant is 2.0 × 102 N/m.
a. What is the elastic potential energy
of the slingshot before it is
released?
Answer:
0.36 J
Explanation:
[tex]PE = \frac{1}{2} kx^{2} \\PE = \frac{1}{2} (200 N/m)(0.06 m)^{2} \\PE = 0.36 J[/tex]
Anything that is thrown or shot through the air is called a projectile. A baseball
player in the outfield throws a ball to home plate. What type of path does the projectile follow?
F. a straight line
G. a curved path upwards
H. a curved path downwards
J. a straight line downwards
Answer:
A curve path downwards
Explanation:
When the ball is thrown, it curves downwards because the earth's core is pulling it out of the sky, and alse becasue the earth is round.
Answer:
H. a curved path downwards
Explanation:
who was the fist man on moon
Answer:
Neil Armstrong
Explanation:
Answer:
Neil Armstrong.
Explanation:
. PLEASE GIVE BRAINLIEST.
PLS HELP ME FAST I NEED TO DO IT NOW
I WILL GIVE YOU 45 POINT
Answer:
A) so the conditions for the expirament don’t affect the outcome
b) to make sure the results are conclusive and accurate
Explanation:
Alkaline earth metals have a low density
true
false
true
Explanation:
this is because melting point and boiling point decreases down the group because they are held together by attractions between positive nuclei and delocalised electrons
what color of colors of light does red glass absorb
Which describes the innermost layer of Earth?
Answer and Explanation:Option A->The innermost layer of the earth is known as the core. It is divided into inner core and outer core. It comprises of a high concentration of nickel and iron.
Hahah I look pregnant don’t I
When solar energy is converted to thermal energy, how is the thermal energy used? Check all that apply.
to provide air conditioning
to cool refrigerators
to heat spaces in buildings
to heat water
Answer:
to heat spaces in buildingss
Explanation:
a car travels at a constant speed of 30km/h for .80h what is the total distance
Answer:
2400 km
Explanation:
30km for 1hr
Need up to 80 hrs , multiply both 80 and 30
So its 2400km
A toy car of mass 1kg moves at 2 m/s. If a 3N force is applied for 1.9 seconds. What is the cars final velocity? Answer to 1 decimal. Help fast please. I'll mark brainliest :)
Answer:
7.7 m/s
Explanation:
Initial speed=2 m/s
mv=Ft
1*v=3*1.9
v=5.7 m/s
5.7+2=7.7
A silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end of the spoon becomes hot even without a
direct contact with the liquid. This phenomenon can be explained by:
Answer:
As atoms in the spoon vibrates about their equilibrium positions and transfer energy form one end to other end. This process is called conduction.
What sport was invented by the English?
Answer:Cricket !
The origins of cricket are very vague, and many theories have been put forward suggesting its origins, but it is, without doubt, very English. The first evidence of cricket being played was recorded in the year 1550, by the pupils of Royal Grammar School, Guildford.
Hope this helps ! ✨How much work is done when a person raises a 10 N bag 5 meters off the ground?
Answer:
Work done W = 50 N-m
Explanation:
Given:
Force F = 10 N
Distance s = 5 meter
Find:
Work done
Computation:
Work done is formulated way that it includes both Applied force upon thing and displacement of thing.
W = fs
W = 10 x 5
Work done W = 50 N-m
A pull back toy car accelerates for 1.8 seconds and covers 4 m while speeding up after being released from rest.
Answer:
Acceleration, a = 2.47 seconds
Explanation:
Given the following data;
Time, t = 1.8 seconds
Distance = 4 meters
Initial velocity = 0 m/s (since it's starting from rest)
To find the acceleration of the toy car, we would use the second equation of motion;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Where;
S represents the displacement or height measured in meters.
u represents the initial velocity measured in meters per seconds.
t represents the time measured in seconds.
a represents acceleration measured in meters per seconds square.
Substituting into the equation, we have;
Substituting into the formula, we have;
[tex] 4 = 0(1.8) + \frac {1}{2}*a*(1.8)^{2}[/tex]
[tex] 4 = 0 + \frac {1}{2}*a*3.24[/tex]
[tex] 4 = \frac {1}{2}*a*3.24[/tex]
Cross multiplying, we have;
[tex] 8 = 3.24a[/tex]
[tex] a = \frac {8}{3.24}[/tex]
Acceleration, a = 2.47 seconds
1. If you add air to a flat tire through a single small entry hole, why does the air spread out to fill the tire?
Answer:
The tire fills up just like anything else that holds air when u pump a ball or tire up it fills all the way up cause it is a small confined space and after filling it with air the atoms of the air fill the tire up
Explanation:
How do mountains affect the climate of a region?
Which of the following is true about the diameter of a circle?
A. The diameter is twice the length of the radius.
B. The diameter is twice the length of the circumference.
C. The diameter is half the length of the circumference.
D. The diameter is half the length of the radius.
Answer:
option A
Explanation:
the diameter is twice the length of the radius
hope it helps