math
what is 21/2 x 1/2
physical
A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the bo...
physical
When 1 g of gasoline is burned in an engine, about 48 kJ of heat is produced. How much mass is lost in the process? Do you think this mass change could directly measured
Science
If there was zero change in Earth’s eccentricity, how might that affect the possibility of an ice age?
physics
. A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...
physics
. A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...
physics
I used the equations of motion for constant acceleration (The object is assumed to fall with the acceleration due to gravity which I took to be 10 m/s^2) Equations of motion: V^2=U^2 + 2*a*s V=U+at Note: when objects rebounds, acceleration = - 10m/s^2 since the latter is a vec...
physics
I worked it out and got 4.8N
science
The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
science
A force of 20 N gives an object an acceleration of 5m/s^2. (a) What force would be needed to give the same object an acceleration of 1m/s^2? (b) What force be needed to give it an acceleration of 10m/s^2?
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