An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N
b. 10 N
c. 89 N
d. 68 N
e. 78 N
D
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Wien's Law: What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ? K.
A. 576 nm B. 578 nm C. 580 nm D. 582 nm
A train moving 30. m/s approaches a station and sounds its whistle and passengers standing at the station hear a pitch of 440. cycles/second. What pitch will be heard when the train is at rest at the station? (assume the air temperature is 20.°C)
What will be an ideal response?
Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N. The support force supplied by the floor must be
A) 150 N. B) 400 N. C) 550 N. D) more than 550 N.
Since it was first predicted in the 1970s, scientists have observed the evaporation of about a dozen black holes
Indicate whether the statement is true or false