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3 years ago

Two ways strong and weak forces are alike?

1 answer:

3 0

Two ways that strong nuclear and weak nuclear forces are alike: Strong nuclear and weak nuclear their alike because they deal with atoms and subatomic particles. ... Two ways that electromagnetic force and gravity are alike: Electromagnetic force and gravity are alike because both of them has an infinity force.

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A 780g, 50-cm-long metal rod is free to rotate about a frictionless axle at one end. While at rest, the rod is given a short but

Semmy [17]

Answer:

9.6 rad/s

Explanation:

$L$ = length of the metal rod = 50 cm = 0.50 m

$M$ = Mass of the long metal rod = 780 g = 0.780 kg

Moment of inertia of the rod about one end is given as

$I = \frac{ML^{2}}{3} = \frac{(0.780)(0.50)^{2}}{3} = 0.065 kgm^{2}$

$F$ = force applied by the hammer blow = 1000 N

Torque produced due to the hammer blow is given as

$\tau = \frac{FL}{2}$

$\tau = \frac{(1000)(0.50)}{2}$

$\tau = 250 Nm$

$t$ = time of blow = 2.5 ms = 0.0025 s

$w$ = Angular velocity after the blow

Using Impulse-change in angular momentum, we have

$I w = \tau t\\(0.065) w = (250) (0.0025)\\w = 9.6 rads^{-1}$

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3 years ago

A woman drives a 45 gram golf ball off of a tee and gives the ball a velocity of 28 m/s to the right. What is the change in mome

lidiya [134]

Answer:

1.26

Explanation:

change 45 grams to kilograms which is 0.045 then just multiply it by 28 m/s

0.045x28=1.260

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2 years ago

What do scientists use to divide the geologic time scale?

dmitriy555 [2]

The use Major changes in mineral deposits in the rock layers.

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3 years ago

A pole vaulter takes 1.3 seconds to fall from peak height to the landing mat. What is his vertical velocity at contact with the

julia-pushkina [17]

$12.75 \frac{m}{s}$

Assuming vertical acceleration of $9.81 \frac{m}{s^2}$ , the speed after x seconds of falling is $9.81x \to 9.81(1.3) = 12.75$

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2 years ago

my choice1A child pushes a toy truck up an inclined plane. The lifting force is...Select one:ut ofO a. the weight of the truck.O

mash [69]

When pushing a toy truck up an inclined plane, the force that makes the truck goes up is the force that the child uses to push the truck. (The force that pushes

Therefore the correct option is C.

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1 year ago