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2 years ago

Use the ideas of stability and centre of mass to

1 answer:

4 0

Answer: Double-decker buses have heavy weights attached to their undersides. b The crane has a heavy concrete block attached to one end of its arm, ant others placed around its base.

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Sophie throws a tennis ball down from a height of 1.5 m at an angle of 450 with respect to vertical. She drops another tennis ba

Katena32 [7]

Given that,

Height =1.5 m

Angle = 45°

We need to find the greater speed of the ball

Using conservation of energy

$P.E_{i}+K.E_{f}=P.E_{f}+K.E_{f}$

$mgh+\dfrac{1}{2}mv_{i}^2=mgh+\dfrac{1}{2}mv_{f}^2$

Here, initial velocity and final potential energy is zero.

$mgh=\dfrac{1}{2}mv_{f}^2$

Put the value into the formula

$9.8\times1.5=\dfrac{1}{2}v_{f}^2$

$v_{f}^2=2\times9.8\times1.5$

$v_{f}=\sqrt{2\times9.8\times1.5}$

$v_{f}=5.42\ m/s$

Hence, the greater speed of the ball is 5.42 m/s.

5 0

3 years ago

A charge of 240C flows through a wire in 3 minutes. Find the electric current flowing through it.

o-na [289]

<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ Use this equation:

Q = IT

Rearrange for I

I = Q/T

Substitute in the values:

I = 240/3

I = 80

The electric current is 80 amps.

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

7 0

3 years ago

Read 2 more answers

ASAP pls answer I will mark brainiest if right.

Sergio039 [100]

1) g
2) b
3) a
4) e
5) c
6) d
7) f

5 0

2 years ago

When you cool matter, what happens to the atoms and molecules?

Phantasy [73]

Answer:

there move slower

Explanation:

because when heated the molecules of the matter[liquid]move faster but when cooled,they move slow or they do not.

5 0

3 years ago

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A dogsled team has a total momentum of 1710 kg•m/s. If the team has a total mass of 450 kg, what is its speed?

HACTEHA [7]

Answer:

3.8 m/s

Explanation:

Momentum is the product of mass and velocity hence

Momentum=mv where m is mass and v is the velocity of an object

Making v the subject of the formula then

$v=\frac {momentum}{m}$

Substituting 1710 kgm/s for momentum and 450 Kg for mass we obtain

$v=\frac {1710 Kgm/s}{450 Kg}=3.8 m/s$

Hence the speed of dogsled team is 3.8 m/s

7 0

3 years ago

Read 2 more answers