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3 years ago

Explain a lever and a pivot in a full sentence

Physics

1 answer:

worty [1.4K]3 years ago

4 0

Answer:

The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.

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You take the mass of the object 400 grams then what do you predict the force needed to move the object at a constant acceleratio

Oksanka [162]

Answer:

Below

Explanation:

To find the force needed to move an object, you can use this formula :

force = (mass)(acceleration)

Plugging our values in...

force = (400g)(3 m/s^2)

= 1,200 Newtons

We can see how this works for the previous answers :

force = (100g)(3 m/s^2)

= 300 Newtons and so on....

Hope this helps! Best of luck <3

6 0

3 years ago

An alien spaceship streaks past Spanos football stadium along the direction of play at 0.8c. A football field is 120 yards long

Viktor [21]

Answer:

(i) Length of stadium, L₀ = 72 yards; width of stadium W = 55 yards (ii) 5 hours (iii) The people on earth. This is because they are not moving at relativistic speed relative to the game. (iv) The people on earth. This is because they are not moving at relativistic speed relative to the game.

Explanation:

(i) Given Length of stadium, L₀ = 120 yards, width of stadium, W₀ = 55 yards, speed of alien spaceship in direction of play, v = 0.8c

We use the equation for length contraction to determine the length of stadium L measured by the alien spaceship, since it is moving in the direction of game play and length contraction only occurs in the direction of motion. So, L = $\sqrt{1-\beta^{2} }$ L₀ where β = $\frac{v}{c}$ v= speed of alien spaceship and c= speed of light. So, β = $\frac{v}{c}$ = $\frac{0.8c}{c}$ = 0.8. Therefore, L = $\sqrt{1-0.8^{2} }$ L₀= $\sqrt{1-0.64}$ L₀= $\sqrt{0.36}$ L₀ = 0.6L₀ = 0.6 × 120 = 72 yards. So, the alien spaceship measures a length of 72 yards. The alien spaceship measures a width,W of 55 yards because there is no length contraction in the direction perpendicular to that of its motion. So, W = W₀ = 55 yards.

(ii) Since the game begins at 1:30 PM Pacific Standard Time (PST) and ends 4:30 PM Pacific Standard Time (PST), the proper time t₀, which is the duration of the event is 4:30 - 1:30 = 3 hours. The time measured by the alien spaceship t (since the time dilates)is given by t = t₀/ $\sqrt{1 - \beta ^{2} }$ . From (i) above β = 0.8 and t₀ = 3 hours. So, t = 3/ $\sqrt{1 - 0.8^{2} }$ = 3/0.6 = 5 hours.

(iii) The people in Spanos football stadium. This is because they are not moving at relativistic speed relative to the game. Since $\frac{v}{c}$ ≈ 0 then β ≈ 0 So, L = $\sqrt{1-\beta^{2} }$ L₀= So, L = $\sqrt{1-0}$ L₀thus L = L₀ for the spectators in spanos football field (iv) The people in Spanos football stadium. This is because they are not moving at relativistic speed relative to the game. Since $\frac{v}{c}$ ≈ 0 then β ≈ 0. So, t = t₀/ $\sqrt{1 - \beta ^{2} }$ = t₀/ $\sqrt{1-0}$ = t₀.Thus t = t₀ for the spectators in spanos football field.

8 0

3 years ago

What is the power of a crane that does 5.60 kJ of work in 2.80 s?

eimsori [14]

Answer:

I don't understand what is a power cane??

6 0

3 years ago

a bat experts a 120 N force on a 0.134 kg baseball for 0.04 seconds. what impolse is excerted on the bat

musickatia [10]

The impulse exerted by a force F on an object in a time $\Delta t$ is given by
$I = F \Delta t$
In our problem, we have a force of 120 N: F=120 N, applied to the baseball for a time of $\Delta t=0.04 s$ . Therefore the impulse is
$I=F \Delta t = (120 N)(0.04 s)=4.8 Ns$

3 0

4 years ago

which of the following locations has the largest electric field? A)0.4 cm from a +3.0 uC point charge B)0.2 cm frm a +1.5 uC poi

JulsSmile [24]

<span>Electric field is proportional to q/d^2, where q is the magnitude of the charge and d is the distance. Since all the given units are identical, we can just compare their relative magnitudes without calculating for the exact values.
A) 3/(0.4)^2 = 18.75
B) 1.5/(0.2)^2 = 37.5
C) 6/(0.4)^2 = 37.5
D) 3/(0.2)^2 = 75
Therefore, choice D has the largest electric field of all.
</span>

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3 years ago

Explain a lever and a pivot in a full sentence​

Explain a lever and a pivot in a full sentence