Circular. Look at a clear horizon, you'll see a curve. Go skydiving. Become smart enough, become an astronaut, go into space and look at the shape of earth yourself.
The electrons in a piece of metal will leave when the polarized magnesis effect is reppeled and heated up to a certain tempeture.
Answer:
Required time t=5.8s
Explanation:
Given data
Acceleration a=3.08 m/s²
Speed v=29.4 m/s
Required
How much time t is required
Solution
As the train passes through the crossing its motion is described by:
Substitute the given values
So
So time required can be calculated by:
Required time t=5.8s
The acceleration is 1.67 m/s²
<u>Explanation:</u>
Given:
Speed, s = 60km/hr
s = m/s
s = 16.67 m/s
Time, t = 10 seconds
Acceleration, a = ?
We know:
On substituting the value, we get:
Therefore, the acceleration is 1.67 m/s²
Answer:
The speed is and the direction is heading north.
Explanation:
In collisions the force exerted by the objects that collide is higher enough than the external forces that we can neglect that external forces, with that assumption we can use the conservation fo momentum law that states, final total momentum (pf) is equal initial total momentum (pi) if there’re not external forces or they are small enough to be neglected. Mathematically:
The total momentum is the sum of the momentum of each of the bodies we're dealing, in our case the moment of each car, then:
with pn the momentum of the 1000kg car heading north and ps the 800kg car heading south. Momentum is defined as mass times velocity, then:
(1)
It's important to note that when we talk about momentum and velocity direction matters, so we're are going to choose a system of reference where quantities pointing north are positive and pointing south are negative. So, the initial velocity of 1000 kg car is vni=5 m/s, initial velocity of 800 kg car is vsi=-4 m/s and the final velocity of 1000 kg car is vnf=-1 m/s. Now we can solve (1) for vsf and use the values we already have:
Because the sign is positive the direction is to heading north.