Answer:
(1) t = 4.29 s
(2) h = 58.98 m
(3) v = 20.04 m/s (downward)
(4) h = 0.94 m
(5) v = 18.78 m/s
Explanation:
Assumption:
during downward motion, acceleration due to gravity, g is positive. (+g)during upward motion, acceleration due to gravity, g is negative. (-g)(1)
initial velocity of the baseball, u = 42.0 m/s
final velocity of the ball, v = 0
time of flight is given by;
v = u -gt
gt = u
t = u / g
t = 42 /9.8
t = 4.29 s
(2)
Given;
initial velocity of the golf, u = 0
final velocity of the golf, v = 34 m/s
the height of the cliff is given by;
v² = u² + 2gh
v² = 0 + 2gh
h = v²/2g
h = (34)²/(2x9.8)
h = 58.98 m
(3)
Given;
initial velocity of the rocket, u = 27 m/s
time of motion, t = 4.8s
final velocity, v = ?
v = u + gt
v = 27 + (-9.8 x 4.8)
v = 27 - 47.04
v = -20.04 m/s (the negative sign indicates downward motion of the rocket after 4.8 s)
(4)
Given;
initial velocity of the lizard, u = 4.3 m/s
final velocity of the lizard at maximum height, v = 0
the height rose by the lizard is given by;
v² = u² + 2(-g)h
0 = u² - 2gh
2gh = u²
h = u² / 2g
h = (4.3)²/(2 x 9.8)
h = 0.94 m
(5)
Given;
initial velocity of the person on the bridge, u = 0
height of the bridge, h = 18 m
final velocity of the person is the velocity at impact, v = ?
v² = u² + 2gh
v² = 0 + 2gh
v² = 2gh
v = √2gh
v = √(2 x 9.8 x 18)
v = 18.78 m/s
Rasheed ran down the football field at a speed of 7m/s. If he got to the end in 23
seconds, how far did he actually run?
Answer:
The answer is 161 mExplanation:
To find the distance covered we use the formula
distance = velocity × timeFrom the question
velocity = 7 m/s
time = 23 s
We have
distance = 7 × 23
We have the final answer as
161 mHope this helps you
Energy must be measured in
Answer:
joule
Explanation:
hop it helps give a good rate ples
Answer:
joule
Explanation:
As trends in global warming continue, people are becoming more and more concerned about the possible effects on specific habitats. Coral reefs and polar ice caps are just two of the many endangered ecosystems due to global warming. The monitoring of life on Earth gives rise to career opportunities in the field of A) ecology. B) genetics. C) medicine. D) animal behavior.
Answer
nbbbbbbbbbbbbbbbbbbbsn
Answer:
a ecology
Explanation
L nathaliedog
2. Rusting is an
example of a
a. physical property.
b. physical change.
C. chemical property.
d. chemical change.
Answer:
rusting is a chemical property because it is irreversible it changes the identity of a substance
Answer:
C. chemical property
Explanation:
a chemical property of iron is that it is capable of combining with oxygen to form iron oxide，the chemical name of rust
How do stars serve as evidence for the expansion of the universe and the Big Bang theory?
Answer:
The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.
(50 POINTS IF ABLE TO GET PLZ EXPLAIN HOW TO SOLVE)A tire is rolled down a hill that is 364.37 m long. If the tire has an acceleration of 0.33 m/s2 and it takes 38.68 s to get all the
way down, how fast was the tire first rolled?
Explain the meaning of the name "black hole". This should be 2-3 sentences. Hint- relate this to density and how it effects things. *
A gravitational field is generated by any object that has
Answer:
two poles
Explanation:
Which best describes why heat pumps are reversible?
O They can heat and cool an indoor space.
O They involve a metal expanding or contracting against another.
They combust and can also add coolant.
They allow a piston to move up and down.
Answer:
I would say the first one.
A: They can heat and cool an indoor space.
Explanation:
Reversible heat pumps are capable of providing both heating and cooling processes using the same two environments. When heating, they use the external pipes to absorb heat and release that heat into the indoor environment. When cooling, they absorb the heat from indoors and release that heat into the outside environment.
Answer:
A
Explanation:
A liquid has a volume of 0.040 and a mass of 30000 what is the density?
Answer:
0Explanation:
Density = Mass/Volume = 0.040/30000 = 0 I hoped this helps you ☺️☺️Thank you ☺️☺️
Convert 6.6 meters to centimeters
Answer:
6.6 Meters = 660 Meters
Explanation:
1 Meter = 100 Centimeters
if you put something like apiece of cardboard between a magnet and a iron nail, the magnet still holds the nail. how?
The mass of a solid cube is 1370 g, and each
edge has a length of 5.18 cm.
Find the density of the cube.
Answer in units of kg/m3
Answer:
D=m/v
Explanation:
1.37kg/1.3899m cube
0.9927kg meter cube
A bus is moving at a constant speed of 30 m/s. How many hours will it take to travel 200 miles?
Answer:
200/67.1224321241 = 2.97962981482 hours to travel 200 miles.
Hope this helps :)
Explanation:
First, convert the speed of the bus back to km/h so it makes things easier. The bus is going at an unreasonably high seed of 108 km/h and will usually result in a crash caused by the driver being unable to control the bus at such high speeds, even it won’t topple over at an inclination of 28 degrees for double decker buses (when the bus is stationary. If the prototypes can’t meet this requirement, the prototype fails the safety test and won’t be used as a bus for carrying passengers).
If you ignore that problem, we will start to do the calculation. 108 km/h is equal to 67.1224321241 mph, so it would take 200/67.1224321241 = 2.97962981482 hours to travel 200 miles.
2.97962981482 hours is equal to 2 hours, 58 minutes, 46 seconds, 667 milliseconds, 333 microseconds and 352 nanoseconds.
Here is the list of descending order of time magnitude of smaller than one second for extra information.
Decisecond = 0.1 second (one tenth)
Centisecond = 0.01 second (one hundredth)
Millisecond = 0.001 second (one thousandth)
Microsecond = 0.000001 second (one millionth)
Nanosecond = 0.000000001 second (one billionth)
Picosecond = 0.000000000001 second (one trillionth)
Femtosecond = 0.000000000000001 second (one quadrillionth)
Attosecond = 0.000000000000000001 second (one quintillionth)
Zeptosecond = 0.000000000000000000001 second (one sextillionth)
Yoctosecond = 0.000000000000000000000001 second (one septillionth)
Planck time = 0.00000000000000000000000000000000000000000001 second
Planck time is the smallest measurable time interval in theory.
Please help me plzzzzz
Answer:
what
Explanation:
Joe runs 30 meters in 5 seconds. He then rests for 15 seconds. Joe runs another 20 meters in 5 seconds. What is joes average speed
Answer:
His average speed is through 4-6.
Explanation:
Because if you divide them both by 5 you get 4 and 6.
7. The English Channel is 35 km wide at its narrowest point, which is where most swimmers attempt to cross north to south from England to France. The current across this portion of the English Channel runs at about 2 km/h east to west.
a. If a swimmer has a relative velocity to the shore of 3 km/h north to south, how long will it take her to cross the 35 km distance?
b. What must be her velocity relative to the water if she has a velocity of 3 km/h north to south relative to the shore?
Answer:
a. 10 hours
b. Approximately 4.03 km/h to shore
Explanation:
The width of the English Channel at the narrowest point = 35 km
The speed of the current across the English Channel across the narrowest point = 2 km/h
a. The relative velocity of the swimmer north to south = 3 km/h
Therefore, the the time it would take the swimmer to swim north to south will be given as follows;
Time = Distance/Velocity = 35 km/(3.5 km/h) =10 hours
The time it would take = 10 hours
It would take 10 hours for her to cross the 35 km distance
b. Given that she has a relative velocity of 3 km/h north to south, we have;
The magnitude of her relative velocity to shore = √((Her relative velocity north to south)² + (The velocity of the English Channel east to west)²)
∴ The magnitude of her relative velocity to shore = √(3.5² + 2²) = (√65)/2 km/h
The magnitude of her relative velocity to shore ≈ 4.03 km/h
You pull a sled with a package on it across a snow-covered flat lawn. If you
apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. What is the
combined mass of the package and the sled? (Assume there is no friction.)
Answer:52.5
Explanation:
You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg
The given data to find Mass,
The force applied to the sled, F = 65.1 N
Acceleration of the sled, a = 1.24 m/s²
What is force?Forces are defined by both strength and direction.
Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.
We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :
F = ma
m = F/a
m = 65.1 /1.24
Mass, m = 52.5 Kg.
If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg
Hence, Option C is the correct answer.
Learn more about Force,
https://brainly.com/question/1222214
#SPJ5
3. What is the instantaneous speed of a car after 3 seconds that is traveling at 30 m/s and accelerates at a constant
rate of 10m/s??
What charges attract and what charges repel??
Answer:
The same charges repel and different charges attract
Explanation:
+ and + repel
- and - repel
+ and - attract
- and + attract
place /our live /music / important / has / in / an
Answer:
Music has an important place in our lives.
How long will it take a cyclist to accelerate to 12 m/s starting from rest if he rides with an average acceleration of 1.2 m/s^2?
"using acceleration formula"
Answer:
The cyclist takes 10 seconds to accelerate to 12 m/s.
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at[/tex]
Solving for t:
[tex]\displaystyle t=\frac{v_f-v_o}{a}[/tex]
The cyclist starts from rest (vo=0) and moves at vf=12 m/s with an acceleration [tex]a=1.2\ m/s^2[/tex].
Calculate the time:
[tex]\displaystyle t=\frac{12-0}{1.2}[/tex]
[tex]\displaystyle t=\frac{12}{1.2}[/tex]
[tex]\boxed{t=10\ sec}[/tex]
The cyclist takes 10 seconds to accelerate to 12 m/s.
A plane moving at a horizontal velocity of 205 m/s drops a piece of cargo which lands 7500 m below. How high is the cargo after 3.5 seconds?
Answer:
well im not gonna give the full answer but the hint im going to give is tht u can use a calculator
Explanation:
what is the net force on a car stopped at a stop sign? what is the net force on a car moving in a straight line with a constant speed?
A variable that is not changed.
A) Dependent Variable
B) Inferential Variable
C) Controlled Variable
D) Independent Variable
Answer:
A controlled variable does not change during a experiment
Explanation:
it's c
Answer:
the Answer is c. The Controlled Variable
Hope this helps!! (:
Explanation:
I just took the quiz and got it right!
A sled covers 20 m from rest and achieves a velocity of 9 m/s under constant acceleration. What is the acceleration of the sled?
Answer:
Explanation:
Givens
d= 20 m
vi = 0
vf = 9 m/s
a = ?
Equation
vf^2 = vi^2 + 2 * a * d
Solution
9^2 = 0 + 2*a*20
81 = 2*a * 20
81 = 40*a
a = 81/40
a = 2.025
Debby and Ben took different routes to travel from Point A to Point E. Debby took the
route along A, B, C, D, and E. Ben took the route along A, G, F, and E. Debby and Ben
both took 4 hours to complete their walk. Their routes are shown.
Route in miles
D2 E
End
B2C
li
F
2
LL
3
10
Start
G
A
Which statement is true about Debby and Ben's average speed?
Debby's average speed was twice Ben's average speed,
Ben and Debby's average speed was the same,
Debby's average speed was three times Ben's average speed,
Ben's average speed was twice Debby's average speed.
Why is circular motion at constant speed not a natural state of motion?
The reason behind circular motion at constant speed is not a natural state of motion is centripetal acceleration acting on it.
What is centripetal acceleration?
Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.
A natural state of motion is that motion where object moves with constant velocity and no acceleration. As in circular motion of an object at constant speed, a constant centripetal acceleration remains, this is not a natural state of motion.
Learn centripetal acceleration here:
https://brainly.com/question/14465119
#SPJ2
Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium?
a) potassium (K)
b) cesium (Cs)
c) magnesium (Mg)
d) titanium (Ti)
Answer:
A i think tell me if i got it right
Explanation:
Based on the location on the periodic table, Potassium (K) is the metal that will be less reactive than rubidium and more reactive than calcium.
the efficiency of transformer is not 100%why?
Answer:
Hysteresis, Eddy current, flux leakage and resistance of winding are those four reasons. It is impossible to overcome this four reasons, Hence transformer never be 100% efficient.