Answers are - A 235 N B 376 N C 271 N D 188 N E 470 N

A mechanic has a wrench where the hand grip is 0.40 m from the axis of the bolt. To apply a torque of 170 N m with this wrench w

Grace [21]

Answer:

4.3 * 10 N

Explanation:

To calculate torque, we multiply the distance from the pivot by the perpendicular (the part of the force that acts at right angles to the displacement vector) component of the force to the displacement vector from the pivot.

torque = distance from pivot * perpendicular force

170 Nm= 0.4 m * F

F = 425 N = 4.3 * 10 N rounded off to two significant figures

4 0

3 years ago

If element x has 10 electrons, how many of them will be in the second energy level?

Sati [7]

the second level will have 8 electrons.

6 0

3 years ago

Concave lenses have _ focal lengths and always form _ images

zhannawk [14.2K]

The correct answer of this question is : Negative focal length and virtual images.

EXPLANATION:

The concave lens is that transparent spherically refracting surface which is diverging in nature. It is so because it is bulged at the edges and thinner in the centre.

The focal length of the concave lens is always taken negative.

As the lens is diverging in nature, it always forms virtual,erect and diminished image. It means the image formed by concave lens has less size as compared to object.

Hence, the correct answer of this question is that concave lenses have negative focal length and always form virtual images.

4 0

3 years ago

What is the force due to gravity on a 1500kg sumo restler?

Jobisdone [24]

Gravitational force = G M₁ M₂ / R²

' G ' is 6.673 x 10⁻¹¹ m³ / kg - s²

In this particular problem,

M₁ is the mass of the Earth = 5.972 x 10²⁴ kg

M₂ is the mass of the wrestler = 1500 kg

' R ' is the distance between their centers. That's the radius of the Earth = 6,371 x 10³ meters

You can stuff all these numbers into the formula for gravitational force, like we did with the 60kg student and the 120kg door.

Or you can just say to yourself: "Self ! This problem is just looking for the wrestler's 'weight'. We know that's just (mass) x (acceleration of gravity). On Earth, the acceleration of gravity is 9.8 m/s². All I have to do is multiply that by his mass of 1500 kg and the answer will be his weight in Newtons."

When you do that, you get

Weight = (9.8 m/s²) x (1500 kg)

Weight = 14,700 Newtons (about 3,307 pounds !)

What happened here ? ? I know he's a Sumo wrestler and all, and they really like to eat. But 3,307 pounds ? ? ?

What happened is the "1500 kg". That can't be correct for a human being. It's more like a small elephant.

I'm pretty sure you mis-copied the problem, and his mass is actually 150kg.

7 0

4 years ago

A soccer player kicks a ball horizontally at 25.0 m/s from a bridge, and the ball hits

san4es73 [151]

Answer: 11.025 meters.

Explanation:

Ok, we know that the initial velocity is only horizontal, so it does not affect the vertical problem.

Looking only at the vertical problem (because we want to know how high is the bridge) we have that:

The acceleration is the gravitational acceleration, g = 9.8m/s^2

A(t) = -9.8m/s^2

Where the negative sign is because this acceleration is downwards.

For the vertical velocity we integrate over time, as we do not have an initial vertical velocity, there is no constant of integration.

V(t) = (-9.8m/s^2)*t

For the position we integrate over time again, here the constant of integration is the initial vertical position, H, that is the height of the bridge.

P(t) = 0.5* (-9.8m/s^2)*t^2 + H.

Now we know that the ball hits the ground 1.5s after it was kicked, then:

p(1.5s) = 0m

With that we can find the value of H.

0 = 0.5* (-9.8m/s^2)*(1.5s)^2 + H.

H = 0.5*(9.8m/s^2)*(1.5s)^2 = 11.025m

5 0

3 years ago

Answers are - A 235 NB 376 NC 271 ND 188 NE 470 N