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LUCKY_DIMON [66]
3 years ago
8

A 70.0 kg sprinter starts a race with an acceleration of 1.60 m/s^2, What is the net external force (in N) on him? (Enter the ma

gnitude.) _________ N
Physics
1 answer:
Ierofanga [76]3 years ago
6 0

Answer:

External force on him will be 112 N

Explanation:

We have given the mass of the sprinter m =70 kg

Acceleration of the sprinter a=1.6m/sec^2

We have to find the net external force

According to second law of motion force = mass ×acceleration

Force is dependent on the mass and acceleration

So F=70\times 1.6=112 N

So external force will be 112 N

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A record turntable rotates through 5.0 rad in 2.8 s as it is accelerated uniformly from rest. What is the angular velocity at th
mr_godi [17]

Answer:

\omega_f = 3.584\ rad/s

Explanation:

given,

turntable rotate to, θ = 5 rad

time, t = 2.8 s

initial angular speed  = 0 rad/s

final angular speed = ?

now, using equation of rotational motion

\theta = \omega_i t + \dfrac{1}{2}\alpha t^2

5 = 0+ \dfrac{1}{2}\alpha\times 2.8^2

\alpha= \dfrac{10}{2.8^2}

       α = 1.28 rad/s²

now, calculation of angular velocity

\omega_f = \omega_i + \alpha t

\omega_f =0 +1.28\times 2.8

\omega_f = 3.584\ rad/s

hence, the angular velocity at the end is equal to 3.584 rad/s

4 0
3 years ago
A car is driving down a highway at a speed of 65 miles per hour. To the nearest second, how long wili it take the car to drive 1
Setler [38]

Answer:

3.1468 sec

Explanation:

We have given the speed of the car is 65 miles/hour

The distance traveled by the car = 100 yards

As it is given that 1 yard = 3 feet

So 100 yard =100×3=300 feet

As in question it is given that 1 mile =5280 feet

So 300 feet =\frac{300}{5280}=0.0568miles

Now time taken =\frac{distance}{speed}=\frac{0.0568}{65}=8.7412\times 10^{-4}hour=3.1468sec

4 0
3 years ago
What is question 10—20 PTS!!
Galina-37 [17]
If my math is correct your answer should be 3.0 but correct me if I'm wrong
8 0
3 years ago
Conventionally, the field strength around a charged object is the direction of the force acting on a .
ExtremeBDS [4]
Unit positive test charge

7 0
2 years ago
Read 2 more answers
Adding heat to a liquid causes which of the following physical changes?
kow [346]
The density would decrease because the mass of an object deals with the amount of atoms in the object and since none of the object was reduced "a" wouldn't be the answer. Depending on the amount and period of time that the heat is applied the liquid could change into a gas so "d" wouldn't be correct. Density is the mass÷ volume, and when you add heat to an object it could take up different amounts of space because of its particles gaining energy and spreading apart. So the density would decrease because of the volume increasing. So I believe that "c" is the answer.
3 0
3 years ago
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