How do you calculate the rate of change of velocity

4. How much would an object accelerate if it has a mass of 25 kg and is pushed with a force of 2 Newtons?

slega [8]

Answer:

0.4

Explanation:

f divided by m = a

3 0

3 years ago

A 5 kg

kotykmax [81]

Answer:

The object-Earth system is open

$F_n=ma=5\ (7.2)=36\ N$

Explanation:

Accelerated Motion

When an object is released in free air (with no other forces than the gravity), it describes a free-fall motion and the formulas include the acceleration of gravity as part of the calculations. But when there is another external force, then the acceleration is not the gravity, but the result of the net force exerted on the mass of the object.

By definition, an open system includes the exchange of energy from and to the surroundings, that is why all systems surrounding our planet are considered as open systems. In our case, the object is interacting with the planet's gravity and there is some other external force, which will be computed later. The object-Earth system is open.

If the object starts from rest, its initial speed is zero, and

$v_f=a\ t$

where a is the acceleration and t is the time. The distance traveled is given by :

$\displaystyle y=\frac{a\ t^2}{2}$

From the two above equations, we find that:

$v_f^2=2ay$

Solving for a

$\displaystyle a=\frac{v_f^2}{2y}$

$\displaystyle a=\frac{12^2}{2\ (10)}$

$a=7.2\ m/s^2$

It means the net force is

$F_n=ma=5\ (7.2)=36\ N$

The object's weight is

$W=5\ (9.8)=49 N$

This means there is some external force acting upwards delaying the object's fall of a magnitude of

$F_e=49-36=13\ N$

3 0

3 years ago

The angle at which a wave strikes a surface is ___ the angle at which the wave is reflected.

Art [367]

Answer:

a)equal to

Explanation:

properties of a wave

applies in reflection

others include:refraction,diffraction,interference

5 0

3 years ago

Which circuit has the largest equivalent resistance?.

Alexeev081 [22]

The series circuit has the higher equivalent resistance, but to find the larger equivalent resistance you have to use Ohm's law (V2=I2R2), the power dissipated by the resistor can also be found using P2=I22R2=V22R2. To find the equivalent resistance of the circuit, notice that the parallel connection of R2 and R3 is in series with R1, so the equivalent resistance is Req=R1+(1R2+1R3)−1=1.00Ω+(16.00Ω+113.00Ω)−1=5.10Ω.

Hope this helps!
Please give Brainliest!

6 0

2 years ago

Two loops of wire are arranged so that a changing current in one will induce a current in the other. If the current in the first

patriot [66]

Answer:

The current in the second loop will stay constant

Explanation:

Since the induced emf in the second coil, ε due to the changing current i₁ in the first wire loop ε = -Mdi₁/dt where M = mutual inductance of the coils and di₁/dt = rate of change of current in the first coil = + 1 A/s (positive since it is clockwise)

Now ε = i₂R where i₂ = current in second wire loop and R = resistance of second wire loop.

So, i₂R = -Mdi₁/dt

i₂ = -Mdi₁/dt/R

Since di₁/dt = + 1 A/s,

i₂ = -Mdi₁/dt/R

i₂ = -M × + 1 A/s/R

i₂ = -M/R

Since M and R are constant, this implies that i₂ = constant

So, the current in the second wire loop will stay constant.

3 0

3 years ago