1.Record her observation with the time it was hot.
2. Gather info about the pavement and its surroundings. Find out what it's made of and what its temp. is at different times of the day.
3. Come up with a hypothesis about why it is hot.
4. Design an experiment to test the hypothesis. If she thinks the Sun is responsible (which she should b smart enough to know), keep it covered during the day time and check it's temp.
5. Come up with a conclusion. If her hypothesis is not supported, design a new experiment or gather more info.
Answer:
The value is 
The direction is into the surface
Explanation:
From the question we are told that
The mass density is 
The coefficient of kinetic friction is 
The current the wire carries is 
Generally the magnetic force acting on the wire is mathematically represented as
Here 
is the frictional force which is mathematically represented as
While 
is the magnetic force which is mathematically represented as
Here 
is the angle between the direction of the force and that of the current
So
So
=> ![B = \mu_k * \frac{m}{L} * [\frac{g}{I} ]](https://tex.z-dn.net/?f=B%20%20%3D%20%20%5Cmu_k%20%2A%20%20%5Cfrac%7Bm%7D%7BL%7D%20%2A%20%5B%5Cfrac%7Bg%7D%7BI%7D%20%5D)
=> ![B = 0.25 * 0.117 * [\frac{9.8}{1.24} ]](https://tex.z-dn.net/?f=B%20%20%3D%20%200.25%20%2A%20%200.117%20%20%2A%20%5B%5Cfrac%7B9.8%7D%7B1.24%7D%20%5D)
=>
Apply the right hand curling rule , the thumb pointing towards that direction of the current we see that the direction of the magnetic field is into the surface as shown on the first uploaded image
Answer:
No
Explanation:
The vertical component of Jack's initial velocity is:
5.0
⋅
sin
30
∘
=
5.0
⋅
1
2
=
2.5
m/s
With gravitational acceleration
9.8
m/s
2
, he will reach the highest point of his trajectory after:
2.5
9.8
≈
0.255
s
The average vertical component of his velocity in that
0.255
s
will be:
1
2
⋅
2.5
=
1.25
m/s
So the highest point of his trajectory will be:
0.255
⋅
1.25
≈
0.32
m
So he will pass approximately
7
cm
above the top of the candle.
The horizontal component of his velocity will be a constant:
5.0
⋅
cos
30
∘
=
5.0
⋅
√
3
2
≈
4.33
m/s
So Jack's trajectory will be substantially longer than it is high and he will spend little time anywhere near above the candle.
A football in flight during a field goal
