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3 years ago

NEED HELP ASAP.. ANSWER AS MANY AS YOU CAN

Physics

2 answers:

Yuri [45]3 years ago

6 0

Answer:q1=a q2=c

Explanation:

ollegr [7]3 years ago

5 0

Answer:

and i cant answer the third question

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A car collides into a concrete wall going 25.0 m/s . It stops in 0.141 seconds and has a change in momentum of 39,400. What is t

vodka [1.7K]

Answer:

Mass of the car is 1576 kg.

Explanation:

Let the mass of the car be $m$ kg.

Given:

Initial velocity of the car is, $u=25\ m/s$

As the car stops, final velocity of the car is, $v=0\ m/s$

Change in momentum is, $\Delta p=39400$

Now, we know that, momentum is given as the product of mass and velocity.

So, change in momentum is given as:

$\Delta p=m(u-v)\\39400=m(25-0)\\39400=25m\\m=\frac{39400}{25}\\m=1576\ kg$

Therefore, the mass of the car is 1576 kg.

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2 years ago

During what stage of engine operation does the piston move upward in the cylinder and force the burned gases out of the cylinder

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*l Take in air and fuel (Intake)
*l Compress (squeeze) the air and fuel (Compression)
*l Ignite and burn the air-and-fuel mixture (Power)
*l Get rid of the burned fuel gases (Exhaust)The Answer is C.Exhaust

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3 years ago

An electric filament lamp is connected to a power supply and switched on.

ladessa [460]

This is because of of the heating effect of a current. The glow is a result of current passing through the filament. The current experiences resistance as a result heat is generated. When resistance is at zero, there potential differences is not needed hence temperature generated will be at a constant.

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3 years ago

A constant force of 45 N directed at angle θ to the horizontal pulls a crate of weight 100 N from one end of a room to another a

Rasek [7]

Answer:

$W=173.48J$

Explanation:

information we know:

Total force: $F=45N$

Weight: $w=100N$

distance: $4m$

vertical component of the force: $F_{y}=12N$

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In this case we need the formulas to calculate the components of the force (because to calculate the work we need the horizontal component of the force).

horizontal component: $F_{x}=Fcos\theta$