Answer: B. The speed will decrease.
Explanation:
When you ride a roller coaster, the wheels rub/scrape the rails, creating heat as a result of friction. And friction will slow you down. So increasing the friction on a roller coaster would slow it down.
Answer:
B
Explanation:
Friction opposes motion therefore reducing motion
How do you measure the wavelength of wave?
Explanation:
by finding the distance between two successful crest
Answer:
the wavelength can be measured as the distance from crest to crest or from trough to trough , the wavelength of a wave can be measured as the distance from a point on a wave to the corresponding point on the next cycle of the wave.
Explanation:
Which of the following is true about the speed of light? (2 points)
Answer:
It is a constant when the light is traveling in a vacuum.
what is the difference between actual velocity and theoretical velocity? please help
An actual velocity is measured directly from an object's displacement-time graph while a theoretical velocity is calculated by using a mathematical equation or scientific theory.
Velocity refers to the rate of change in displacement (distance) of an object with respect to time.
Also, velocity is a vector quantity and this simply means that, it has both magnitude (speed) and direction.
Mathematically, velocity is given by the formula;
[tex]Velocity =\frac{displacement}{time}[/tex]
In an experiment, there are two (2) main types of velocity used and these include:
Actual velocity: it is a velocity that is measured directly from a displacement-time graph and it represents the true velocity of an object or physical body.Theoretical velocity: this is a type of velocity that is taken as an accepted (known) value of velocity because it is determined by using a mathematical equation or scientific theory.In conclusion, an actual velocity is measured directly from an object's displacement-time graph while a theoretical velocity is calculated by using a mathematical equation or scientific theory.
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A robot probe drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is -3.7 m/s^2. Find the velocity with which the camera hits the ground.
Answer:
42.05 m/s
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 0 m/s
Height (h) = 239 m
Acceleration due to gravity (g) = 3.7 m/s²
Final velocity (v) =?
The velocity with which the camera hits the ground can be obtained as follow:
v² = u² + 2gh
v² = 0² + 2 × 3.7 × 239
v² = 0 + 1768.6
v² = 1768.6
Take the square root of both side
v = √(1768.6)
v = 42.05 m/s
Therefore, the velocity with which the camera hits the ground is 42.05 m/s
which instrument is used to compare the mass of a balance
Answer:
balance is tha answer hope it us helpful
Explanation:
for most everyday objects scientist use a balance to obtain an object mass .A Balance compares an object with a known mass to object the question
how can gravitational energy play an important part of my life
Answer:
Explanation:
Well, lets say you park your car on the top of a hill, gravitational energy prevents it from the car falling back. Or a snow pack, aka before a potential avalanche. Though gravity cannot keep it safe forever, gravitational energy keeps it from crashing asap. In this case, it gives you time to escape. Altogether, gravitational force keeps the earth in it's atmosphere.
The coefficient of kinetic friction between a couch and the floor is 0.65. If the
couch has a mass of 42 kg and you push it with a force of 600 N, what is the
net force on the couch as it slides?
A. 868 N
B. 188 N
C. 452 N
O D. 332 N
Answer: D. 332n
Explanation: I took the quiz and that was the correct answer
When a toy car is moving across a flat surface, what forces are acting on it (gravity, tension, spring, friction,air,normal,applied)?
Answer:
I believe gravity is acting on it
Since sound is a mechanical wave it needs a ...... to travel through
Answer:
medium
Examples:
A medium is a thing that the sound wave would travel through, like sound waves traveling through air. A mechanical wave cannot travel without a medium, like if the wave were trying to travel through a vacuum.
16. Through which of the following mediums is the velocity of a sound wave the greatest?
A. Steel
B. Lend
Water
D. Air
A.) Steel.
steel travels 5,060 meters per second,
lead travels 1,402 meters per second,
water travels 1,439 meters per second,
and air depends on temperature.
why is it better to hold a musical events or programs in the evening?
Answer:
sound travels faster in the night
Explanation:
A pile of boxes exerts a force of 500 newtons downward on the floor. The boxes are not in motion. What is the normal force on these boxes?
Answer:
Weight of the pile of boxes as I think
Speed is determined based on two factors. What are they
Answer:
distance and time
Explanation: the farther you go and how much time it will take you
what is the number of significant digits in the measurement 10.005m?
A coin released at rest from the top of a tower hits the ground after falling 1.5 s. What is the speed of the coin as it hits the ground? (Disregard air resistance. a = −g = −9.81 m/s 2 .)
Initial speed of the coin (u)= 0 (As the coin is released from rest)
Acceleration due to gravity (a) = g = 9.81 m/s²
Time of fall (t) = 1.5 s
From equation of motion we have:
[tex] \boxed{ \bf{v = u + at}}[/tex]
By substituting values in the equation, we get:
[tex] \longrightarrow [/tex] v = 0 + 9.81 × 1.5
[tex] \longrightarrow [/tex] v = 14.715 m/s
[tex] \therefore [/tex] Speed of the coin as it hits the ground/Final speed of the coin = 14.715 m/s
The speed of the coin as it hits the ground is 14.715 m/s.
We can solve the problem above using the equation of acceleration under gravity.
⇒ Equation:
v = u+gt................... Equation 1
⇒ Where:
The final velocity of the coinu = Initial velocity of the coing = acceleration due to gravityt = timeFrom the question,
⇒ Given:
u = 0 m/s (from rest)t = 1.5 sg = -9.81 m/s²Substitute these values into equation 1
v = 0+1.5(-9.81)v = -14.715 m/sNote the speed has a negative sign because it acts in the same direction as the acceleration due to gravity
Hence, the speed of the coin as it hits the ground is 14.715 m/s.
Learn more about gravitational motion here: https://brainly.com/question/17785701
the density of mercury is 13600 kg/m3 at 0°C. what is its density at temperature 100°C
Answer:
13700 kg÷m2Explanation:
100c+13600kg÷m2
The density of mercury is 13600 kg / m³ at 0 °C. Its density at a temperature of 100 °C is 0.735 × 10⁻⁴ kg / m³.
What is density?The mass of a material substance per unit volume is its density. The formula for density is [tex]d = M/V[/tex] Where d represents density, M is mass, and V is volume. Density is commonly measured in grams per cubic centimeter.
As an example, the density of Earth is 5.51 grams per cubic centimeter, but the density of water is 1 gram per cubic centimeter.
Given:
The density of mercury, d = 13600 kg / m³,
The temperature difference. ΔT = 100 - 0 = 100 °C,
Calculate the change in volume if the mass is 13.6 kg and the coefficient of cubical expansion is 1.82×10⁻⁴ °C⁻¹ by the formula given below,
ΔV = V α ΔT
ΔV = (13.6 ÷ 13600) × 1.82 × 10⁻⁴
ΔV = 0.00182 × 10⁻⁴ m³
New volume V₁ = V + ΔV = 13.6 ÷ 13600 + 0.00182 × 10⁻⁴
New density d₁ = V₁ / 13.6 = 10.00182 × 10⁻⁴ / 13.6 = 0.735 × 10⁻⁴ kg / m³
Therefore, the density of mercury is 13600 kg / m³ at 0 °C. Its density at a temperature of 100 °C is 0.735 × 10⁻⁴ kg / m³.
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#SPJ2
c) What is the time interval in which the average velocity is
Zero?
Negative?
Positive?
a) Find the displacement (value and direction) between t = 0 and t = 5 s.
Answer:
Is always negative answer for you
please help out here thanks a bunch
A force of 16 N to the west is applied to each object below.
Which object will undergo the greatest change in momentum?
A. A 44 kg object that is moving east at 5 m/s
B. A 41 kg object that is moving east at 5 m/s
C. A 44 kg object that is moving east at 10 m/s
D. A 41 kg object that is moving east at 10 m/s
Answer:
A. A 41 kg object that is moving east at 5 m/s
Explanation:
I'm taking this test and got it right.
As a red of recent weather activity, there’s less water available for human consumption. Which blome is affected by the most by this change?
Answer:
The freshwater biome will be most likely to be affected by the weather conditions as the freshwater reservoirs accumulates water from sources like rain, flood and melting of snow. The reservoirs form are groundwater, river, lakes, ponds and others. In the absence of rain the water will not be accumulated in the biome and will effect the life forms living there.
Explanation:
which one of the following is true
a. momentum results in a change of force
B. a force results in a change of momentum
Answer:
B
Explanation:
You need a specific force to change the momentum of something.
Hope this helps!
what property do protons can electrons have that neutrons do not ?
Answer:
Protons and electrons are charged particles. Neutrons have no charge.
An object takes 5 seconds to travel 25 meters. What is its speed?
Answer:
5m/s is the answer s=d/t 25/5=5m/s
Answer:
5m/s
Explanation:
The formula for speed is s=distance/time. The distance traveled was 25 meters. The time it took to travel that distance was 5 seconds. Therefore, s= 25m/5s to give an answer of 5 m/s
what is the definition of normal force
Answer:
the amount of force that keeps two surfaces touching, but does not let them come apart or press further together
Explanation:
Hope this helps - Good luck ^w
Normal force is the support force exerted upon an object that is in contact with another stable object.
An arrow is projected by a bow vertically up with a velocity of 40 m/s, and reaches a target in 3 s. What is the velocity of the arrow just before it hits the target? How high is the target located?
Answer:
Explanation:
Step one:
given data
initial velocity u= 40m/s
time taken t=3seconds
final velocity v=?
Step two:
applying the first equation of motion
v=u-gt--- (the -ve sign implies that the arrow is against gravity)
assume g=9.81m/s^2
v=40-9.81*3
v=40-29.43
v=10.57m/s
Step three:
how high the target is located
applying
s=ut-1/2gt^2
s=40*3-1/2(9.81)*3^2
s=120-88.29/2
s=120-44.145
s=75.86m
How long would it take for someone to bike to school if the school is 10 km away and the
cyclist is riding at 5 km/hr
Answer:
It would take the cyclist 2 hours to cycle to school.
Explanation:
5km/hr for 2 hours would be 10km.
Geological and atmospheric changes happening over a ______ time scale can cause______ extinctions.
Fill in the blanks folks..
Answer:
Long short
Explanation:
1
Dogs that are bigger are selected to be parents.
2
The parents are bred together, and their offspring will be different sizes.
3
The biggest offspring will be selected and bred together.
4
This cycle continues until the dogs have been selectively bred to be bigger than the current world record size.
5
Selective breeders need to ensure that they are not also selecting for disadvantageous traits, like genetic limb defects.
Ur gonna need this...
Brainliest plzzz..thanks..sorry Messy
Answer:
Geological and atmospheric changes happening over a long time scale can cause short extinctions.
Explanation:
Why do we have to think safe when performing ballroom dances or any other for of dance?
Answer:
We have to think safe when performing ballroom dances or any other form of dance due to dance moves being a physical activity which is usually prone to some form of accidents.
This is because it involves the movement of various parts of the body which has joints and such joints could easily be sprained when the wrong steps are taken which is usually why caution should be taken.
Owing the swift movements involved in a ballroom dance, we must think safe when performing a ballroom dance.
Dance involves the movement of parts of the body. Usually, these body movements are swift and vigorous. As a result of the vigor involved in moving the body during a dance, it is necessary to exercise caution.
Therefore, it is important to think safe during a ballroom dance to avoid a sprain or fracture or any other kind of injury.
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A person lifts a package weighing 75 N. If she lifts it 1.2 m off the floor, what work has she done?
Answer:
The answer is 90 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 75 × 1.2
We have the final answer as
90 JHope this helps you
Answer:
[tex]\boxed {\boxed {\sf 90 \ Joules}}[/tex]
Explanation:
Work can be found by multiplying the force by the distance.
[tex]W=f*d[/tex]
The force of the package is 75 newtons.
The distance the package is lifted off the ground is 1.2 meters.
[tex]f= 75 \ N \\d=1.2 \ m[/tex]
Substitute the values in and multiply.
[tex]W= 75 \ N *1.2 \ m[/tex]
[tex]W=90 \ N*m[/tex]
1 Newton meter (N*m) is equal to 1 Joule (J).
Therefore, our answer of 90 Newton meters is equal to 90 Joules.
[tex]W= 90 \ J[/tex]
The work done is 90 Joules.
A battery and a resistor are wired into a circuit. The resistor dissipates 0.30 W. Now two batteries, each identical to the original one, are connected in series with the resistor. What power does it dissipate?
Answer:
1.2 W
Explanation:
Let the value of resistance be R , emf of battery be E
current i = E / R
power = i² R
= E² x R / R²
= E² / R
Given
E² / R = .30
when two batteries are connected
Total emf = 2E
current = 2E / R
Power = ( 2E / R )² x R
= 4 E² / R
= 4 x .30
= 1.2 W .
