How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s?
4.0 J?
-----------------------
NO
force = 9.81 * 2 Newtons
so power = 9.81*4 Newton meters/sec or Watts
please check my answers
what are the SI units for momentum?
kg*m/s
which of the following is not involved in hitting a tennis ball?
a. kinetic energy
b. chemical potential energy
c. gravitational potential energy
d. elastic potential energy
i picked B
How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s?
4.0 J?
i'm not sure about the last one..thanks for checking:)
3 answers
The first two are correct. For the last one, you have to multiply M g by vertical speed to get power in Watts (Joules per second).
2.0 x 9.8 x 2.0 = ? W
2.0 x 9.8 x 2.0 = ? W
A 60 kg skier is coasting down a 30° slope. Near the top of the slope, her speed is 4.0 m/s. She accelerates down the slope due to the gravitational force, but she is also experiencing a friction force with a magnitude of 80 N apposing her motion. Ignoring air resistance, what is her speed once her displacement is 70 m along the path of travel?
2 answers