Before starting this problem, review Conceptual Example 3 in your text. Suppose that the hail described there comes straight down at a mass rate of m/?t = 0.030 kg/s and an initial velocity of v0 = -15 m/s and strikes the roof perpendicularly. Suppose that the hail bounces off the roof of the car with a velocity of +15 m/s. Ignoring the weight of the hailstones, calculated the force exerted by the hail on the roof. __________N
Answers
Answer:
0.9 N
Explanation:
The force exerted on an object is related to its change in momentum by:
where
F is the force exerted
is the change in momentum
is the time interval
The change in momentum can be rewritten as
where
m is the mass
u is the initial velocity
v is the final velocity
So the formula can be rewritten as
In this problem we have:
is the mass rate
is the initial velocity
is the final velocity
Therefore, the force exerted by the hail on the roof is:
Related Questions
When one type of energy changes to another type of energy *A. constantB. energy conservationC. energy transformationD. Other:
Inertia is ______ to mass. directly proportional inversely proportional equal to not related to
Table salt is blank mixed with other compunds
Find the total displacement of a mouse that travels 1.0m north and then 0.8m south.
the theory of Pangaea.
c.
sea-floor spreading.
b.
the age of the Earth.
d.
the theory of Gondwana.
help please
Answers
Magnetic reversal proves seafloor spreading because we can see the polarity of the Earth’s magnetic field in rocks. As magma cools, particles in it solidify in the direction of the magnetic field. By looking at these particles, scientists can see the polarity of the magnetic field at the time the rocks were created.
Answer:
c. sea-floor spreading.
Answers
Answer:
the center of gravity moves by 1.9 m towards the origin
Explanation:
from the question we are given the following
John's mass (Mj) = 91.2 kg
Barbara's mass (Mb) = 51.9 kg
John's location (Xj) = + 9.99 m
Barbara's location (Xb) = +3.27 m
center of mass (X) = ?
the center of mass is where the masses of John and Barbara is concentrated, and it is given by the formula below
X = ( ( Mj x Xj ) + ( Mb x Xb ) ) / (Mj + Mb)
X = ( ( 91.2 x 9.99 ) + ( 51.9 x 3.27 ) ) / ( 91.2 + 51.9 )
X = 7.6 m
now when they switch positions their locations now become
John's location (Xj) = + 3.27 m
Barbara's location (Xb) = +9.99 m
now putting their new locations into the formula
X = ( ( 91.2 x 3.27 ) + ( 51.9 x 9.99 ) ) / ( 91.2 + 51.9 )
X = 5.7 m
therefore the center of mass moves by
7.6 - 5.7 = 1.9 m
the center of gravity moves by 1.9 m towards the origin
Answers
Answer: 54 miles in 1hr 30min
Explanation:
The train travels at a constant speed of 36 miles per hour. To find out how far it can travel in 1 hour 30 minutes, we need to convert the time to hours. Since there are 60 minutes in 1 hour, 1 hour 30 minutes is equal to 1.5 hours (1 hour + 30 minutes/60 minutes). To calculate the distance traveled, we multiply the speed of the train (36 miles per hour) by the time it travels (1.5 hours). So, the train can travel 36 miles per hour * 1.5 hours = 54 miles in 1 hour 30 minutes. Therefore, the train can travel a distance of 54 miles in 1 hour 30 minutes
C.) They could not measure a change in stars' positions on the sky.
D.) They could not measure how big the Earth was.
Answers
Answers
Answer:
98.13m
Explanation:
Complete question
Daniel is 50.0 meters away from a building. Tip of the building makes an angle of 63.0° with the horizontal. What is the height of the building
CHECK THE ATTACHMENT
From the figure, using trigonometry
Tan(θ ) = opposite/adjacent
Where Angle (θ )= 63°
Opposite= X = height of the building
Adjacent= 50 m
Then substitute the values we have
Tan(63)= X/50
1.9626= X/50
X= 1.9626 × 50
X= 98.13m
Hence, the height of the building is 98.13m
B. Give explanations for natural events
C. Make predictions
D. Produce unchanging, absolute answers