Answer:
[tex]V_R=5.80mph(-\hat j )[/tex]
Explanation:
From the question we are told that
Speed of man [tex]V_m=3.30mph[/tex]
Speed of wind [tex]V_w=-2.70mph[/tex]
Generally the Relative wind speed V_R is mathematically given directly as
[tex]V_R=V_w-V_m[/tex]
[tex]V_R=-2.7-3.30[/tex]
[tex]V_R=-5.80mph[/tex]
Therefore the relative wind speed will the person sense
[tex]V_R=5.80mph(-\hat j )[/tex]
A tourist drops (from rest) a ping pong ball from the top of the tower, which has a height of 174 meters. Assuming no air resistance, how long does it take for the ping pong ball to hit the ground
Given :
A tourist drops (from rest) a ping pong ball from the top of the tower, which has a height of 174 meters.
To Find :
How long does it take for the ping pong ball to hit the ground ?
Solution :
We know, equation of motion of object doing free fall is :
[tex]s = ut + \dfrac{gt^2}{2}[/tex] ....1)
Here, g = 9.8 m/s² ( acceleration due to gravity )
Also, u = 0 m/s ( its free fall )
Putting these values in equation 1), we get :
[tex]174 = 0 + \dfrac{9.8\times t^2}{2}\\\\t = \sqrt{\dfrac{174\times 2}{9.8} }\ s\\\\t = 5.96 \ s[/tex]
Therefore, ball will take 5.96 s to hit the ground.
A man runs 300 m West in 60 seconds. He then runs 100 m
North-west in 20 seconds.
What is his average velocity in metres per second?
Answer:
5 m/s
Explanation:
Total distance = 300 + 100 = 400m
Total time = 60 + 20 = 80s
Velocity = 400/80 = 5m/s
Average velocity of man is 5 meter per second.
To find the average speed of an object we divide the total distance travelled by the total time time taken by object.
Total distance travelled by man = 300 + 100 = 400 m
Total time taken by man = 60 + 20 = 80 seconds
Average velocity,[tex]=\frac{400}{80} =5m/s[/tex]
Thus, Average velocity of man is 5 meter per second.
Learn more:
https://brainly.com/question/23856383
A bus has a speed of 1.3 m/s and a mass of 12,000 kg. A baseball has a
speed of 44.7 m/s and a mass of 0.145 kg. What is the kinetic energy of the
bus?
Answer:
find it yourself too lazy for math but here's the step
Explanation:
it's the object mass multiplied by the velocity.
A 800kg car produces a motive force of 10,000N.
As it accelerates from rest it experiences a frictional resistance of 2,000N.
What is the net force acting on the car?
Answer:
the net force on the car is 8,000 N.
Explanation:
Given;
mass of the car, m = 800 kg
motive force of the car, F = 10,000 N
frictional force experienced by the car, Fk = 2,000 N
The net force on the car is calculated as;
∑F = F - Fk
∑F = 10,000 - 2,000
∑F = 8,000 N
Therefore, the net force on the car is 8,000 N.
A 2.5x10-3 kg paint chip comes off a satellite orbiting Earth. The velocity of the paint chip is
7000 m/s. Which is the kinetic energy of the paint chip?
F 1750)
G 6125 )
H 12.250
24,500
(7 Points)
Answer:
G. 6125
Explanation:
Step one:
given data
mass m= 2.5x10-3 kg
velocity v= 7000 m/s
Required
The kinetic energy
Step two:
The expression for the kinetic energy is
KE= 1/2m v^2
KE= 1/2*2.5x10^-3*7000^2
KE= 0.5*2.5x10^-3*7000^2
KE= 0.5*2.5x10^-3*49000000
KE= 0.5*122500
KE=6125J
• 0.4kg
• 2.5kg
•10kg
•250kg
Please help
The graph below shows the composition of the air we breathe. Which of the following statements correctly classified the air we breathe?
A. The air we breathe is an element because it is made of pure substances
B. The air we breathe is a compound because it is made of different pure substances.
C. The air we breathe is a heterogeneous mixture because it had visibly different substances and phases.
D. The air we breathe is a homogeneous mixture because it has substances but the same appearance throughout.
Answer:
D. The air we breathe is a homogeneous mixture because it has substances but the same appearance throughout.
Explanation:
The air we breathe is a homogeneous mixture.
Air is a mixture of many gases. A homogeneous mixture is one whose constituents exists in one phase.
Air is a gas - gas mixtures.
A mixture has indefinite composition. They consist of two or more elements and or compounds in any proportion by mass.
Constituents retain their identities i.e. physical properties are retained.
In a fusion reactor, the high temperature of the order of 10 8 K is required in order that what condition is met
Answer:
High temperature of 108 million K
Explanation:
For the fusion reactor to be able to work optimally, then one of the most important conditions is the necessity of a very high temperature of about 108 million Kelvin. This is quite large, and is about six times hotter than the temperature existing at the core of the sun. At this temperature, the hydrogen state of the element is not a gas, but rather it is a plasma. Here, the atoms will be stripped of their electrons and are allowed to move freely. This condition is akin to the perfect condition for the reactor to function. It makes the hydrogen atoms gather enough energy for the reaction that takes place in the subsequent phases of this process.
