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eduard
3 years ago
10

Which type of energy will definitely not be used in the lighting of a match?

Physics
1 answer:
In-s [12.5K]3 years ago
4 0
I say that the answere would be B
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Lucas is carrying his rock collection into class. He carries 30 pounds of rare rocks 15 feet into Classroom 6. It takes him 3 mi
weqwewe [10]

you would multiply 30 by 15. because its the weight times the distance.

3 0
3 years ago
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An airplane is flying with a velocity of 100 m/s at an angle of 25° above the horizontal. When the plane is 114 m directly above
alex41 [277]

Answer:

The suitcase will land 976.447m from the dog.

Explanation:

The velocity in its component in the X and Y axis is decomposed:

Vx= 100m/s × cos(25°)= 90.63m/s

Vy= 100m/s × sen(25°)= 42.26m/s

Time it takes for the suitcase to reach maximum height, the final speed on the axis and at the point of maximum height is zero whereby:

VhmaxY= Voy- 9.81(m/s^2) × t ⇒ t= (42.26 m/s) / (9.81(m/s^2)) = 4.308s

The space traveled on the axis and from the moment the suitcase is thrown until it reaches its maximum height will be:

Dyhmax= Voy × t - (1/2) × 9.81(m/s^2) × (t^2) =

= 42.26m/s × 4.308s - 4.9 (m/s^2)  × (4.308s)^2 =

=182.056m - 90.938m= 91.118m

The time from the maximum height to touching the ground is:

Dtotal y= 114m + 91.118m = (1/2) × 9.81(m/s^2) × (t^2) =

= 205.118m = 4.9 (m/s^2) × (t^2) ⇒ t= (41.818 s^2) ^ (1/2)= 6.466s

The total time of the bag in its rise and fall will be:

t= 4.308s + 6.466s = 10.774s

With this time and the initial velocity at x which is constant I can obtain the distance traveled by the suitcase on the x-axis:

Dx= 90.63 (m/s) × 10.774s = 976.447m

8 0
3 years ago
Which resistors in the circuit must have the same amount of energy per unit charge across them?
egoroff_w [7]
<span>The correct answer is D): resistors B and C. In fact, the energy per unit charge is equal to the voltage across the resistors. The electrical potential energy is in fact: </span>U=qV<span>, where q is the charge and V is the voltage; by rearranging the equation, we have </span>V= \frac{U}{q}<span>, therefore the voltage is the energy per unit charge. In the circuit in the figure, the resistors B and C are connected to the same points of the circuit (they are connected in parallel), therefore they have the same voltage, so they have the same energy per unit charge.</span>
6 0
3 years ago
Read 2 more answers
A father and his son want to play on a seesaw. Where on the seesaw should each of them sit to balance the torque?
vladimir1956 [14]

Answer:

A The father should sit closer to the pivot.

C The longer wrench makes the job easier because less force is needed when there is more distance from the pivot.

A As far from the head of the hammer as possible because this will maximize torque.

D at the opposite side of the seesaw towards the middle

:) gl

Explanation:

3 0
3 years ago
A person walks briskly at 1.90 m/s .how much time will it take them to walk one mile?
Paladinen [302]

As in question, the speed of person is given m/s whereas the distance he needs to cover is given in miles.

Formula to calculate the time,

Distance = velocity \times time

To get the correct answer, convert the distance in to miles.

1 mile = (1\times1.6093)\times1,000=1,609.3

Therefore,

1,609.3 meters = 1.90 m/s \times time

or  

time = \frac{1,609.3 m}{1.90 m/s}

time = 847 s


5 0
3 years ago
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