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3 years ago

What makes a grenade explode?

1 answer:

6 0

The striker throws the safety lever away from the grenade body as it rotates to detonate the primer. The primer explodes and ignites the fuse The fuse burns down to the detonator, which explodes the main charge

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A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward

Romashka-Z-Leto [24]

The rocket starts at rest, so its initial velocity is 0. If the burn phase lasts $t$ seconds, then during this interval the rocket's velocity is

$v=at\implies a=\dfrac{30\,\frac{\mathrm m}{\mathrm s}}t$

and its position is

$x=\dfrac12at^2\implies a=\dfrac{2(49\,\mathrm m)}{t^2}$

So we have

$\dfrac{30\,\frac{\mathrm m}{\mathrm s}}t=\dfrac{2(49\,\mathrm m)}{t^2}\implies t=3.3\,\mathrm s$

and the answer is C.

4 0

3 years ago

Two guy's masses have gained a velocity (not equal to zero) which means their momentum is now _____ .

olya-2409 [2.1K]

Yes The Velocity will change

7 0

4 years ago

Read 2 more answers

Two vehicles, a car and a truck, leave an intersection at the same time. The car heads east at an average speed of 20 miles pe

leva [86]

Answer:

$d = 10\times t\sqrt{29}miles$

Explanation:

Given:

't' hour be the time taken for travel by both the vehicles and 'd' be the distance between then

then

Distance traveled by the car = 20 × t miles

and

Distance traveled by the truck = 50 × t miles

now, using the Pythagoras theorem

$d = \sqrt{(20t)^2+(50t)^2}$

$d = \sqrt{400t^2+2500t^2}$

$d = \sqrt{2900t^2}$

$d = 10\times t\sqrt{29}$

thus, the equation relating the distance 'd' with the time 't' comes as

$d = 10\times t\sqrt{29}miles$

7 0

4 years ago

What is the momentum of a 12,000 kg car moving at a speed of 40 m/s?

Harman [31]

Momentum = (mass) x (speed)

Momentum = (12,000 kg) x (40 m/s)

Momentum = (12,000 x 40) kg-m/s

Momentum = 480,000 kg-m/s

8 0

4 years ago

Which statements describe elements? Check all that apply.

solmaris [256]

The answers are B, C, E and F.

Atoms from an element is mostly made of protons, neutrons, and electrons. Proton numbers are like a class number for each element. Each element has their own and they're all different. And the number of protons are equal to the number of electrons. Therefore, B is correct.

Isotopes. It's different atoms from a same element that has the same number of protons but different number of neutrons. For example in hydrogen, there's 3 Isotopes for hydrogen. Therefore, C is correct.

Again, proton for the same element is never changed, even if they're different Isotopes. So, E is correct.

Isotopes, again, different elements may have different Isotopes. Some has only 1, others may have a few or more. So, F is correct too.

8 0

4 years ago

Read 2 more answers