Answer: 120 km
Explanation:
Distance= speed x time
her speed is 40km/hr
and her time was 3 hours
40x 3= 120 km
What does Magnitude means?
Speed
Speed
Amount
Amount
Distance
Distance
Interval
Answer:
Speed
Explanation:
Hope this helps!
The Moon is 4,530,000,000 years old. Convert the Moon's age to scientific notation.
Answer:
4.53×10^9 years old.
Explanation:
Scientific notation is a mathematical term or expression that illustrates a method of representing actual numbers or figures that are often considered too substantial or too insignificant to be written appropriately using normal decimal representation. It can be depicted as "a x 10^n"
Hence, in this case, converting the age of the moon which is 4,530,000,000 years old to scientific notation is equal to 4.53×10^9 years old.
Answer:
4.53×10^9 years old.
A student measured the specific heat of water to be 4.29 J/g.Co. The
literature value of the specific heat of water is 4.18 J/g.Co. What was the
student's percent error? *
A) .0256%
B) 2.56%
C) 2.63%
D) .0263%
Answer:
2.63 %.
Explanation:
Given that,
The calculated value of the specific heat of water is 4.29 J/g.C
Original value of specific heat of water is 4.18 J/g.C.
We need to find the student's percent error. The percentage error in any quantity is given by :
[tex]P=\dfrac{|\text{original value-calculated value}|}{\text{original value}}\times 100\\\\P=\dfrac{4.29-4.18}{4.18}\times 100\\\\P=2.63\%[/tex]
So, the student's percent error is 2.63 %.
Answer:
c
Explanation:
Which of the following elements would be predicted to be the best conductor of electricity? - sodium (Na) - germanium (Ge) - sulfur (S) - neon (Ne)
Answer:
sodium
Explanation:
Answer:
sodium
Explanation:
Bailey was driving down the street on her motorcycle and reduced her velocity from 25
m/s to 15 m/s over a distance of 8 meters. What is the magnitude of the motorcycle's
acceleration during this time!
Answer:
a = - 25 m/s²
Explanation:
The magnitude of acceleration or deceleration of an object can be found by using the third equation of motion as follows:
2as = Vf² - Vi²
where,
a = magnitude of acceleration = ?
Vf = Final Velocity = 15 m/s
Vi = Initial Velocity = 25 m/s
s = distance traveled = 8 m
Therefore,
2a(8 m) = (15 m/s)² - (25 m/s)²
a = (- 400 m²/s²)/(16 m)
a = - 25 m/s²
Here negative sign indicates deceleration
An airplane accelerates down a runway at 3.0 m/s/s for 10 s until it finally lifts off the ground.
Determine the velocity at take-off.
Answer:
30 m/s
Explanation:
Given:
v₀ = 0 m/s
a = 3.0 m/s²
t = 10 s
Find: v
v = at + v₀
v = (3.0 m/s²) (10 s) + 0 m/s
v = 30 m/s
what type of resource is water
Answer: Renewable Resource
Explanation: There isn't a limited supply of water, which makes it a renewable resource.
Answer:
in my view water is the combination of oxygen (1) part and hydrogen (2) part
Which of the following is NOT a unit of measurement in the metric system?
1.meter
2.second
3.centimeter
4.foot
Answer:
Your answer should be d: Foot
Explanation:
The unit "foot" is part of the english system which includes inches, feet, yards, etc.
A projectile is launched at a 30° angle relative to the
ground. The projectile has an initial velocity of 15 m/s
and travels through the air for 2 seconds.
The horizontal displacement of the projectile, rounded to
the nearest hundredth, is
m.
Answer:
25.98
Explanation:
right answer
The horizontal displacement of the projectile is 25.98 m.
The given parameters;
angle of projection Ф = 30°
initial velocity of the projectile, u = 15 m/s
time of motion, t = 2 seconds
The horizontal displacement of the projectile is calculated as follows;
[tex]X = v_0_x \times t\\\\X = v_0 cos (\theta) \times t\\\\X = 15\times cos (30) \times 2\\\\X = 25.98 \ m[/tex]
Thus, the horizontal displacement of the projectile is 25.98 m.
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why VR is not affected by friction?
Answer:
Explanation:
VR ( Velocity ratio ) is the ratio of displacement to effort of load. So it is obvious that displacement takes place. Frictional force cannot change the displacement as it only an opposing force. So VR is not affected by friction.
Hope this helps
plz mark as brainliest!!!!!!!!
Answer:
because VR is velocity ratio
Question 11
1 pts
What is the acceleration of a 24kg mass pushed by a 6N force?
Answer:
4?
Explanation:
215 = 25x – 35, solve for x.
Answer:
x = 10
Explanation:
215 = 25x – 35
215 + 35 = 25x
250 = 25x
x = 250 / 25
x = 10
a penguin swimming underwater goes 20 meters in 8 seconds. what is its average speed?
Answer:
The Average Speed Is 2.5 m/s
Explanation:
when the wind blows it creates a pressure on any force it blows against. A large pressure window has an area of 3.5m2. If the wind causes a pressure of 2000Pa on the window what force acts on it?
Answer:
The force acting on the window is 7000N.
Explanation:
Given that the formula for pressure of solid is P = Force/Area. Then, you have to substitute the values into the formula :
[tex]pressure = \frac{force}{area} [/tex]
[tex]let \: pressure = 2000,area = 3.5[/tex]
[tex]2000 = \frac{force}{3.5} [/tex]
[tex]2000 \times 3.5 = force[/tex]
[tex]force = 7000N[/tex]
Given:-
Area of the window = 3.5 m²Pressure generated = 2000 PaTo Find: Force exerted by the air to the window.
We know,
P = F/A
where,
P = Pressure,F = Force &A = Area.Similarly,
F = PA
→ F = (2000 Pa)(3.5 m²)
→ F = (2000 N/m²)(3.5 m²)
→ F = (200 N)(35)
→ F = 7000 N (Ans.)
15 POINTS! ANSWER CORRECTLY FOR BRAINLIEST!
Which factor makes the mesosphere difficult to study?
A. It is too high for weather balloons
B. It is too high for satellites to observe
C. Cloud cover makes it too hard to see
D. The ozone layer blocks our view
(I honestly think it's A but I just want other peoples opinions)
Credit: Larus (Full Credits to Larus I didn't make this answer)
The correct answer is that it is too high for the weather balloons.
The mesosphere refers to the layer of the atmosphere of the Earth. It is present directly above the stratosphere and below the thermosphere. It elongates from about 50 to 85 kilometers above the Earth. The coldest temperatures in the atmosphere of the Earth, that is, around -90 degree C, is found close to the top of the layer.
It is tough to study mesosphere, therefore, less is known about the layer of the atmosphere in comparison to the other layers. It is tough as weather balloons cannot fly high enough to reach the mesosphere. The satellites orbit above the mesosphere, and cannot directly determine the traits of the layer.
The electric field of a charge is defined by the force on what kind of particle?
a) electron.
b) proton.
c) source charge.
d) probe charge.
Answer:
correct answers C
Explanation:
the electric field is derived from Coulomb's law, where the charge has been assumed to be positive.
The expression remains
F = k q₁ q / r²
the electric field is
Fe = (k q₁ / r²) q
The amount between parentises rs constant
by checking the correct answers C
How many vector quantities are given in this paragraph? Two hikers, on the Appalachian Trail, travel northeast along the trail for 2.5 miles. They average a
2.3 mile/hour pace in that direction. The temperature increases to 88°F as the sun
rises. They stop for a moment to drink 600 mL of water from their water bottles. The
trail shifts slightly to a due north direction as they walk for 5.0 more miles. By this
time the hikers are ready to eat lunch. The hikers remove their 25.0 kg backpacks
and sit on a log that is off the trail. They eat and rest for 45 minutes, and resume
their walk due north for 2 more miles.
5 vector quantities
9 vector quantities
4 vector quantities
2 vector quantities
Answer:
4 vector quantities
Explanation:
There are 4 vector quantities given in the paragraph, therefore the correct answer for the given problem statement is option C
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
While the scalar quantities do not contain the information of the direction they only have a magnitude of the quantity measured.
As stated in the issue On the Appalachian Path, two hikers cover 2.5 miles to the northeast of the trail. They move along there at a mean speed of 2.3 miles per hour.
They continue walking for another 5.0 miles till the trail gently changes to a straight north direction. The trekkers are now eager to have their lunch.
The hikers take off their 25.0-kilogram backpacks and sit on an unmarked log.
They take 45 minutes to eat, relax, and then continue walking 2 more miles due north.
In the given paragraph there are 3 displacement vectors along with one velocity vector therefore there are 4 vector quantities.\
Thus, there are 4 vector quantities and the correct answer is option C
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Why echo sound cannot be heard in small room
How long is a football field?
Answer:
91.44 meters or 300 feet
Answer:
100 yards
Explanation:
If comparing from actual playing field between the goal posts. Add another 10 yards for end lines. Making it 120 yards in length.
The baseball weighs 1 kg. The pitcher throws the ball at a velocity of 10 m/s straight up. Neglecting air resistance, what is the net force that acts on the baseball when it is HALF WAY to the top of the path
Answer:
9.81 N
Explanation:
Given that a baseball weighs 1 kg. The pitcher throws the ball at a velocity of 10 m/s straight up. Neglecting air resistance. The maximum height reached will be calculated by using the formula
V^2 = U^2 - 2gH
U = 10 m/s
g = 9.8m/s^2
At maximum height, V = 0
Substitute u and g into the formula
0 = 10^2 - 2 × 9.8 × H
19.6H = 100
H = 100/19.6
H = 5.1 m
The Kinetic energy on the ball will be
K.E = 1/2mv^2
K.E = 1/2 × 1 × 10^2
K.E = 1/2 × 100
K.E = 50 J
But energy = work done
WD = Force × distance (height)
The force that acts on the baseball when it is HALF WAY to the top of the path will be
F × 5.1/2 = 50
F = 100/5.1
F = 19.61 N
The weight acting downward will be
W = mg
W = 1 × 9.8
W = 9.8 N
The net force acting on the ball will be
Net force = F - W
Net force = 19.61 - 9.8
Net force = 9.81 N
Therefore, the net force that acts on the baseball when it is HALF WAY to the top of the path is 9.81 N
Pedro walks 6,500 ft daily to go to school, how many km is it equivalent to?
Answer:
This is equal to 1.9 kilometers.
Explanation:
For every foot it is 0.0003048 so multiply this number by 6500 and get your answer. Hope this helps have a good day
Why would scientists call solids and liquids a condensed phase of matter?
Explanation:
Liquids and solids are often referred to as condensed phases because the particles are very close together.
Can somone help me with this problem I have been stuck on it for a while. The answer is 17.1m but I dont understand how to get it. If you dont know dont answer or I will report you.
Hi There, Buddy!
To solve this problem, let us divide the entire motion into 2 phases
1.) When the elevator is moving with an acceleration
2.) When the elevator has a deceleration
For the first half -
u = 0 , a = 0.6 , t = t1
v = 0.6(t1) ---------- ( 1 )
s = 1/2 x 0.6 x (t1)^2 = 0.3(t1^2) -------- ( 2 )
For the second half -
u = 0.6(t1) , a = -0.8 , v = 0
0.6 x (t1) = 0.8 (t2) ----> 3(t1) = 4(t2) ---------- ( 3 )
0.36(t1)^2 = 1.6 s2 ---------- ( 4 )
Now, we know that the total time taken is 10 seconds
------- t1 + t2 =10 , 3t1 = 4t2 ---- t1 = 40/7 , t2 = 30/7
Now, substitute values of t1 and t2 in s1 and s2 and add both s1 and s2 to get total distance travelled.
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help pleaseeee my brainnn stopped working once again lol
Answer:
1c 2a 3b
Explanation:
An _____ has a different number of electrons than normal.
A. isotopes
B. elements
C. ions
Answer:
isotopes
Explanation:
A cross country skier moves from location A to location B to location C to location D. Each leg of the back and forth motion takes 1 minute to complete; the total time is 3 minutes.
What is the distance travelled by the skier in the first minute?
What is the displacement of the skier in the first minute?
What is the distance travelled by the skier in the first two minutes?
Please help it’ll be greatly appreciated!!
Answer:
1. 160
2. 0
3. 120
Explanation:
When a substance experiences a phase change (state of matter change) is this a chemical or physical change? How do you know?
Answer:its a physical change as state of matter changes without any reactions
Explanation:when a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring
light travels 3,00,000km/s. ls it right velocity or speed?
Answer:
speed
Explanation:
because speed is fast
Answer: Speed
Explanation:
In a vacuum , which has a greater acceleration while in free fall: a 7kg bowling ball or a 0.007 kg feather?
a) It depends on the air resistance
b) they will have the same acceleration
c) the feather
d) the bowling ball
Answer:
b) They will have the same accelerationExplanation:
The acceleration of an object in free fall is known as the acceleration due to gravity, g, which is due to the attractive force of the Earth's gravitational field on the object. and is given by the following formula;
[tex]g = G \times \dfrac{Mass \ of \ the \ Earth}{(Distance \ between \ the \ object \ and \ the \ center \ of \ the \ Earth)^2}[/tex]
[tex]g = G \times \dfrac{M}{r^2}[/tex]
r = R + h
Where;
R = The radius of the Earth
h = The height of the center of the object above Earth's surface
Therefore, due to the large magnitude of R, and the comparatively small magnitude of h, R + h is approximately R, that is R + h ≈ R and R ≈ r, which gives;
[tex]g = G \times \dfrac{M}{R^2}[/tex]
Therefore, given that, the mass of the Earth, M, the radius of the Earth, R and the gravitational constant, G, are all constant, the value of g is therefore, constant for all objects and the value is approximately 9.81 m/s².
What makes up all type of matter in living and nonliving things in an ecosystem?
Producers are responsible for making all types of matter in living and non-living things in an ecosystem.
What do you mean by Ecosystem?An ecosystem may be defined as a place or area where members of different species live together and interact with one another for the purpose of food, shelter, and space.
Producers are organisms which always found at the bottom of each trophic level of an ecosystem. These organisms synthesize their own food and energy from carbon dioxide in presence of sunlight.
After synthesizing energy, they transform their energy to higher trophic levels. Apart from this, several biotic and abiotic factors are also responsible for making up the type of matter in living and nonliving things in an ecosystem.
Therefore, producers are responsible for making all types of matter in living and non-living things in an ecosystem.
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