These are questions I'm unsure about out of 20 for my submission #2. Someone please check soon. My answers have an =.
1.)A ball is rolling across the top of a billiard table and slowly rolls to a stop. How would Galileo explain the motion of the ball as it stopped?
a)The ball's natural state is at rest b)The ball stopped because it ceased to be pushed
=c)The ball stopped due to external forces such as friction
2.)The distance an object travels per unit of time
=a)Is its speed
b)Is its velocity
c)Is its acceleration
3.) A man leaves his house and begins walking in a straight line. After 2 hours he is ten miles from home. Calculate the man's average speed in terms of feet per second. (There are 3600 seconds in an hour and 5280 feet in a mile.)
a).14 feet per second
b)1.47 feet per second
=c)7.33 feet per second
d)380160000 feet per second
4.)A woman is walking at a rate of 4 miles per hour. Her pet hedgehog is walking at a rate of 5.82 feet per second. Who is traveling faster?
=a)The woman
b)The hedgehog
c)Neither, they are traveling at the same speed
5.)The distance and direction an object travels per unit of time
a)Is its speed
=b)Is its velocity
c)Is its acceleration
6.)A car traveling at 8m/s due north speeds up to 10m/s in the same direction. If it takes the car 5 seconds to change its velocity what is the car's acceleration?
a).2m/s2
=b).4m/s2
c).8m/s2
d)2m/s2
all correct, go to the head of the class.
Thanks:)
Okay when it comes down to ariel. you are INCORRECT .
CORRECT
p.s sorry for the misspelling.
1.) How would Galileo explain the motion of the ball as it stopped?
Galileo would explain that the ball stopped due to external forces such as friction. To understand this, we need to know that objects in motion tend to stay in motion unless acted upon by an external force. In this case, the external force of friction acts on the ball, gradually slowing it down and eventually bringing it to a stop.
2.) The distance an object travels per unit of time is its speed.
So the answer is a) Is its speed.
Speed is a scalar quantity, which means it only has magnitude and no direction. It tells us how fast an object is moving but does not indicate the direction.
3.) To calculate the man's average speed in terms of feet per second:
We are given that the man walked 10 miles in 2 hours. To convert miles to feet, we multiply by 5280 (the number of feet in one mile). To convert hours to seconds, we multiply by 3600 (the number of seconds in one hour).
Therefore, the calculation is as follows:
10 miles * 5280 feet/mile = 52800 feet
2 hours * 3600 seconds/hour = 7200 seconds
Average speed = distance traveled / time taken = 52800 feet / 7200 seconds ≈ 7.33 feet per second
So, the correct answer is c) 7.33 feet per second.
4.) Who is traveling faster, the woman or the hedgehog?
To compare the speeds of the woman and the hedgehog, we need to ensure that we are comparing the speeds in the same units.
The woman's speed is given as 4 miles per hour, which can be converted to feet per second:
4 miles * 5280 feet/mile = 21120 feet
1 hour * 3600 seconds/hour = 3600 seconds
Speed of the woman = 21120 feet / 3600 seconds ≈ 5.87 feet per second
The hedgehog's speed is given as 5.82 feet per second.
Comparing the two speeds, we can see that the hedgehog is traveling faster.
So, the answer is b) The hedgehog.
5.) The distance and direction an object travels per unit of time is its velocity.
So, the answer is b) Is its velocity.
Velocity is a vector quantity, which means it has both magnitude (speed) and direction. It tells us both how fast an object is moving and in which direction it is moving.
6.) What is the car's acceleration?
Acceleration is the rate at which an object's velocity changes over time. To calculate acceleration, we need the initial velocity, final velocity, and the time taken.
In this case, the initial velocity is 8 m/s, the final velocity is 10 m/s, and the time taken is 5 seconds.
Acceleration = (final velocity - initial velocity) / time taken
Acceleration = (10 m/s - 8 m/s) / 5 seconds
Acceleration = 2 m/s / 5 seconds
Acceleration = 0.4 m/s^2
So, the correct answer is b) 0.4 m/s^2.