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2 years ago

If an object is not moving, what do we know about the forces acting on it?

Physics

2 answers:

Nat2105 [25]2 years ago

7 0

I think it should be 'They are balanced' if I'm not wrong

erik [133]2 years ago

7 0

If the object is not moving then the forces acting on it are balanced. Also if the object is moving in a straight line at a constant speed than the forces on it are also balanced.

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The amount of matter in an object is called its weight true or false

Deffense [45]

Answer:

true

Explanation:

logic

4 0

2 years ago

Read 2 more answers

A car of mass 960.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 51.1 km/hr (14.2 m/s),

blagie [28]

Answer:

$0.27 m/s^2$

Explanation:

The power supplied by the engine is given by

P = Fv

where

F is the force applied

v is the velocity of the car

Here we have

P = 3700 W

v = 14.2 m/s

So we can solve the equation to find the average force:

$F=\frac{P}{v}=\frac{3700 W}{14.2 m/s}=260.6 N$

The net force applied on the car is also equal to

F = ma

where

m = 960.0 kg is the mass of the car

a is the acceleration

Re-arranging the equation, we find the acceleration:

$a=\frac{F}{m}=\frac{260.6 N}{960.0 kg}=0.27 m/s^2$

5 0

3 years ago

1. A 1.6 kg lab cart accelerates from 0.5 m/s to 4.3 m/s in 0.8 seconds.

Naddika [18.5K]

Answer:

(a) 4.75 m/s² (b) 7.6 N

Explanation:

Given that,

The mass of a lab cart, m = 1.6 kg

Initial speed, u = 0.5 m/s

Final speed, v = 4.3 m/s

Time, t = 0.8 s

(a) The acceleration of an object is equal to the rate of change of velocity. It can be calculated as :

$a=\dfrac{v-u}{t}\\\\a=\dfrac{4.3-0.5}{0.8}\\\\a=4.75\ m/s^2$

(b) Let F be the net force on the cart. It can be given by :

F = ma

$F=1.6\times 4.75\\\\F=7.6\ N$

Hence, this is the required solution.

5 0

2 years ago

The mass of helium atoms are higher than predicted given the number of protons. Helium atoms have an actual mass of about 4 amu.

BaLLatris [955]

Answer : Helped understand why the mass of each element was what it was.

Explanation: In other words, the discovery of the neutron helped people understand why a certain element had the mass it did. This is because the number of protons plus the number of neutrons equals the mass of an element, which wasn’t known until the discovery of the neutron.

7 0

2 years ago

You drop a ball from a window on an upper floor of a building and it is caught by a friend on the ground when the ball is moving

Marysya12 [62]

Answer:1.44 s,10.17 m

Explanation:

Given

two balls are separated by a distance of 41.1 m

One person drops the ball from a height of 41.1 and another launches a ball with velocity of 41.1 m exactly at the same time.

Let the ball launches from ground travels a distance of x m in t sec

For Person on window

$41.1-x=ut+\frac{1}{2}gt^2$