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the answer to your question!
Answer:
Explanation:
we know that acceleration =Δv/t
Δv=vf-vi
Δv=1.0-5.5=-4.5
now
a=-4.5/3.0
a= -1.5m/s²
Answer:1590 N
Explanation:
Impulse = change in momentum/time
change in momentum = 0 - 50 x 35 = -1750
-1750/1.1 = 1590 (3s.f.) N
Answer:
Temperature change observed in following material from least change to most change:
1. Water
2. Aluminium
3. Copper
4. Brass
5. Silver
6. Platinum
Explanation:
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
Higher the specific heat of a material, more the heat is required to change its temperature.
Thus the arrangement of materials in descending order of their specific heat gives us the list of materials with temperature change from least to most.
Answer:
Explanation:
Since we need to find the force that the second child must exert to keep the door from moving, that means that the door is in equilibrium, which occurs when the net torque is zero:
The torque is defined as:
Where F is the applied force, r is the distance between the force and the pivot point (hinges) and 
is the angle between F and r. Both children push perpendicular to the door, so we have 
. Replacing in (1) and solving for 
:
